Additional functionality to util package

[mwieser]

• Extend util package with helper functions.
  • Add MIME interface to use mimtype.MIME or an already KnownMIME
  • Add function to detach context to avoid context cancelation. Can be used to pass context information to go routines without a deadline or cancel
  • Add oauth2 helper for PKCE extention
  • add where IN and NIN helper using pg.StringArray to support more arguments
  • add helper to copy test file into folder unique to the test and cleanup helper
• Add starttls support to mailer
  • Extend mailer mock to support waiting for all expected mails to arrive to test mails sent in go routines
• update CHANGELOG with information about deprecated mail tls change
• fix bug detecting test env when running the debugger

[MorpheusXAUT]

LGTM

[codecov]

Codecov Report

Patch coverage: 90.20% and project coverage change: +0.94 🎉

Comparison is base (d14d4b2) 62.86% compared to head (be48d27) 63.80%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   62.86%   63.80%   +0.94%     
==========================================
  Files          78       86       +8     
  Lines        6053     6239     +186     
==========================================
+ Hits         3805     3981     +176     
- Misses       1635     1643       +8     
- Partials      613      615       +2     

Impacted Files	Coverage Δ
internal/util/test.go	42.85% <33.33%> (-57.15%)	⬇️
internal/util/oauth2/pkce.go	44.44% <44.44%> (ø)
internal/util/int.go	60.00% <60.00%> (ø)
internal/util/context.go	33.33% <66.66%> (+11.11%)	⬆️
internal/util/db/db.go	76.59% <87.50%> (+5.62%)	⬆️
internal/test/helper_files.go	93.10% <93.10%> (ø)
internal/config/server_config.go	98.16% <100.00%> (+0.01%)	⬆️
internal/util/bool.go	100.00% <100.00%> (ø)
internal/util/currency.go	100.00% <100.00%> (ø)
internal/util/db/ilike.go	100.00% <100.00%> (ø)
... and 8 more

... and 2 files with indirect coverage changes

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