Add support for EC mTLS keys

[jack-berg]

Resolves #4918.

This adds support for EC mTLS keys in addition to the currently supported RSA keys. The tricky bit is determining which algorithm type the key is, and therefore which KeyFactory to use to generate the private key. Bouncy castle apparently has a decent way to do this, but we should try to do it without additional dependencies if possible. The strategy I've taken in this PR is to create a list of supported algorithms, and determine which the key corresponds to by iterating through them and trying generate a private key with a try / catch.

[codecov]

Codecov Report

Base: 90.90% // Head: 91.05% // Increases project coverage by +0.14% 🎉

Coverage data is based on head (bc24f8b) compared to base (51ff803).
Patch coverage: 86.66% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4920      +/-   ##
============================================
+ Coverage     90.90%   91.05%   +0.14%     
- Complexity     4803     4808       +5     
============================================
  Files           545      544       -1     
  Lines         14340    14318      -22     
  Branches       1383     1367      -16     
============================================
+ Hits          13036    13037       +1     
+ Misses          897      884      -13     
+ Partials        407      397      -10     

Impacted Files	Coverage Δ
...va/io/opentelemetry/exporter/internal/TlsUtil.java	85.93% <86.66%> (-0.34%)	⬇️
...va/io/opentelemetry/sdk/logs/SdkLoggerBuilder.java	100.00% <0.00%> (ø)
...a/io/opentelemetry/sdk/logs/SdkLoggerProvider.java	100.00% <0.00%> (ø)
.../io/opentelemetry/sdk/logs/LogRecordProcessor.java	85.71% <0.00%> (ø)
...a/io/opentelemetry/sdk/trace/SdkTracerBuilder.java	100.00% <0.00%> (ø)
.../io/opentelemetry/sdk/metrics/SdkMeterBuilder.java	100.00% <0.00%> (ø)
...opentelemetry/sdk/logs/NoopLogRecordProcessor.java	100.00% <0.00%> (ø)
...pentelemetry/sdk/logs/MultiLogRecordProcessor.java	90.90% <0.00%> (ø)
...entelemetry/sdk/logs/SdkLoggerProviderBuilder.java	100.00% <0.00%> (ø)
...metry/sdk/logs/export/BatchLogRecordProcessor.java	88.97% <0.00%> (ø)
... and 14 more

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[jack-berg]

@jkwatson take a look when you have a chance. Would be good to get this in for the next release.

[yunchen-myob]

@jkwatson take a look when you have a chance. Would be good to get this in for the next release.

Can I know when is the next release?

[jkwatson]

@jkwatson take a look when you have a chance. Would be good to get this in for the next release.

Can I know when is the next release?

We try to release the end of the first week of the month.