Port dotnet cataloger to new generic cataloger pattern

[wagoodman]

Follow up to #1281 , porting the APK cataloger to the new generic.Cataloger

This additionally brings in a new internal/pkgtest helper functions to aid in making tests easier to make (if you're using the generic cataloger). I was finding I was making the exact same changes to tests everywhere, and the code was very boilerplate... thus a helper test function makes sense here. I also found that the comparison function I was using wasn't considering all fields of the elements under test, which means there may be issues that are not raised during testing.

If accepted, I'll head back to the catalogers I just updated and move the pattern forward there as well.

[github-actions]

Benchmark Test Results

Benchmark results from the latest changes vs base branch

name                                                       old time/op    new time/op    delta
ImagePackageCatalogers/alpmdb-cataloger-2                    12.8ms ± 4%    11.5ms ± 1%  -10.06%  (p=0.016 n=5+4)
ImagePackageCatalogers/ruby-gemspec-cataloger-2              1.56ms ±14%    1.30ms ± 1%  -16.72%  (p=0.008 n=5+5)
ImagePackageCatalogers/python-package-cataloger-2            3.61ms ± 3%    3.25ms ± 1%   -9.88%  (p=0.008 n=5+5)
ImagePackageCatalogers/php-composer-installed-cataloger-2    1.19ms ± 2%    1.06ms ± 1%  -11.27%  (p=0.008 n=5+5)
ImagePackageCatalogers/javascript-package-cataloger-2         836µs ± 2%     739µs ± 0%  -11.58%  (p=0.008 n=5+5)
ImagePackageCatalogers/dpkgdb-cataloger-2                     990µs ± 2%     872µs ± 0%  -11.93%  (p=0.008 n=5+5)
ImagePackageCatalogers/rpm-db-cataloger-2                    1.46ms ±10%    1.26ms ± 0%  -14.05%  (p=0.008 n=5+5)
ImagePackageCatalogers/java-cataloger-2                      16.8ms ± 1%    14.3ms ± 0%  -15.10%  (p=0.008 n=5+5)
ImagePackageCatalogers/apkdb-cataloger-2                     1.48ms ± 4%    1.23ms ± 2%  -17.20%  (p=0.008 n=5+5)
ImagePackageCatalogers/go-module-binary-cataloger-2          2.48µs ±12%    2.19µs ± 2%  -11.53%  (p=0.008 n=5+5)
ImagePackageCatalogers/dotnet-deps-cataloger-2               1.68ms ± 5%    1.36ms ± 1%  -18.92%  (p=0.008 n=5+5)
ImagePackageCatalogers/portage-cataloger-2                    859µs ± 1%     700µs ± 1%  -18.57%  (p=0.008 n=5+5)

name                                                       old alloc/op   new alloc/op   delta
ImagePackageCatalogers/alpmdb-cataloger-2                    5.26MB ± 0%    5.26MB ± 0%     ~     (p=0.690 n=5+5)
ImagePackageCatalogers/ruby-gemspec-cataloger-2               202kB ± 0%     202kB ± 0%     ~     (p=1.000 n=5+5)
ImagePackageCatalogers/python-package-cataloger-2             944kB ± 0%     944kB ± 0%     ~     (p=0.841 n=5+5)
ImagePackageCatalogers/php-composer-installed-cataloger-2     213kB ± 0%     213kB ± 0%     ~     (p=0.690 n=5+5)
ImagePackageCatalogers/javascript-package-cataloger-2         158kB ± 0%     158kB ± 0%     ~     (p=1.000 n=5+5)
ImagePackageCatalogers/dpkgdb-cataloger-2                     203kB ± 0%     203kB ± 0%     ~     (p=0.222 n=5+5)
ImagePackageCatalogers/rpm-db-cataloger-2                     301kB ± 0%     302kB ± 0%   +0.17%  (p=0.008 n=5+5)
ImagePackageCatalogers/java-cataloger-2                      3.44MB ± 0%    3.44MB ± 0%     ~     (p=1.000 n=5+5)
ImagePackageCatalogers/apkdb-cataloger-2                     1.25MB ± 0%    1.25MB ± 0%     ~     (p=0.151 n=5+5)
ImagePackageCatalogers/go-module-binary-cataloger-2            672B ± 0%      672B ± 0%     ~     (all equal)
ImagePackageCatalogers/dotnet-deps-cataloger-2                368kB ± 0%     376kB ± 0%   +2.31%  (p=0.008 n=5+5)
ImagePackageCatalogers/portage-cataloger-2                    136kB ± 0%     136kB ± 0%     ~     (p=0.524 n=5+5)

name                                                       old allocs/op  new allocs/op  delta
ImagePackageCatalogers/alpmdb-cataloger-2                     85.7k ± 0%     85.7k ± 0%     ~     (p=1.000 n=5+5)
ImagePackageCatalogers/ruby-gemspec-cataloger-2               4.24k ± 0%     4.23k ± 0%     ~     (p=0.095 n=4+5)
ImagePackageCatalogers/python-package-cataloger-2             16.5k ± 0%     16.5k ± 0%     ~     (p=0.198 n=5+5)
ImagePackageCatalogers/php-composer-installed-cataloger-2     5.50k ± 0%     5.50k ± 0%     ~     (p=0.159 n=5+5)
ImagePackageCatalogers/javascript-package-cataloger-2         3.31k ± 0%     3.31k ± 0%     ~     (p=1.000 n=5+5)
ImagePackageCatalogers/dpkgdb-cataloger-2                     4.57k ± 0%     4.57k ± 0%     ~     (all equal)
ImagePackageCatalogers/rpm-db-cataloger-2                     8.11k ± 0%     8.11k ± 0%     ~     (all equal)
ImagePackageCatalogers/java-cataloger-2                       57.5k ± 0%     57.5k ± 0%     ~     (p=0.341 n=5+5)
ImagePackageCatalogers/apkdb-cataloger-2                      5.39k ± 0%     5.39k ± 0%     ~     (p=0.238 n=5+4)
ImagePackageCatalogers/go-module-binary-cataloger-2            15.0 ± 0%      15.0 ± 0%     ~     (all equal)
ImagePackageCatalogers/dotnet-deps-cataloger-2                7.15k ± 0%     7.32k ± 0%   +2.41%  (p=0.008 n=5+5)
ImagePackageCatalogers/portage-cataloger-2                    3.58k ± 0%     3.58k ± 0%     ~     (all equal)