chore: relint & update

[fredbi]

• updated go version requirement to go1.19

• updated dependencies, excepted:

  • yaml (upgrade to v3 deferred to another PR)
  • otel (upgrade is breaking: deferred to another PR)

• ci: updated linting rules, in line with other go-openapi repos

  • exception: disabled the "nilerr" linter, which currently crashes for this repo

• ci:updated github actions, in line with other go-openapi repos

• doc: updated README links and badges

• major relinting of all test code

• relinting non-test code is deferred to another PR (hopefully with less changes)

• changes to non-test code are limited to:

  • addition of (temporary) nolint directives
  • gofmt/typos in comments
  • unused params

TODO in forthcoming PRs:

• upgrade to yaml/v3
• upgrade OTEL packages
• gradually remove most "nolint" directives in non-test code
• complete test refactoring: some nolint directives have been added to skip more complex refacoring (e.g. duplicate code)

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (1ade6d4) 80.26% compared to head (e4cc157) 80.26%.

Files	Patch %	Lines
client/request.go	80.00%	1 Missing ⚠️
client/runtime.go	80.00%	1 Missing ⚠️
middleware/context.go	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #269   +/-   ##
=======================================
  Coverage   80.26%   80.26%           
=======================================
  Files          44       44           
  Lines        3350     3350           
=======================================
  Hits         2689     2689           
  Misses        546      546           
  Partials      115      115           

Flag	Coverage Δ
oldstable	80.26% <92.50%> (?)
stable	80.26% <92.50%> (?)

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[fredbi]

NOTE to reviewers

Ok so this one is huge. Apologies... That's because this PR has long been overdue...

To simplify a bit the review process, I've not addressed (yet) linting issues in non-testing code other
than adding nolint directives. So go files which are not test programs should normally only differ in their comments, or changes that can be verified at build time (e.g. unused parameter declaration, gofmt).

Hopefully this PR makes more readable to contributors the huge work that has been accumulated to test thoroughly this package.

[fredbi]

Status of the above-mentioned forthcoming PRs:

• upgrade to yaml/v3: upgraded to yaml.v3 #270
• upgrade OTEL packages upgraded opentelemetry client to OTEL v1.17.0 #271
• gradually remove most "nolint" directives in non-test code
• complete test refactoring: some nolint directives have been added to skip more complex refacoring (e.g. duplicate code)