feat: wrap the final response from /oauth2/authorize in a transaction

[alnr]

Primarily, this is a performance enhancement when using CockroachDB global tables.

[codecov]

Codecov Report

Merging #3595 (5b1505f) into master (eb89af7) will decrease coverage by 0.08%.
Report is 1 commits behind head on master.
The diff coverage is 70.21%.

❗ Current head 5b1505f differs from pull request most recent head fa79917. Consider uploading reports for the commit fa79917 to get more accurate results

@@            Coverage Diff             @@
##           master    #3595      +/-   ##
==========================================
- Coverage   76.39%   76.31%   -0.08%     
==========================================
  Files         130      130              
  Lines        9746     9766      +20     
==========================================
+ Hits         7445     7453       +8     
- Misses       1799     1807       +8     
- Partials      502      506       +4     

Files Changed	Coverage Δ
cmd/server/handler.go	1.33% <0.00%> (-0.04%)	⬇️
consent/handler.go	65.07% <ø> (+0.90%)	⬆️
x/clean_sql.go	90.90% <0.00%> (-0.21%)	⬇️
oauth2/handler.go	65.66% <36.36%> (-1.48%)	⬇️
consent/strategy_default.go	68.97% <100.00%> (+0.47%)	⬆️
persistence/sql/persister_oauth2.go	84.88% <100.00%> (-0.65%)	⬇️

[aeneasr]

All important changes from this PR are on master already, with the exception of the transaction which is done in https://github.com/ory/hydra/pull/3763/files

[aeneasr]

You can just use Transaction for this as it's using the same underlying context key: https://github.com/ory/hydra/pull/3763/files