Update documentation for the next release, Refactor the container API

[oleg-nenashev]

Aligns #30 and #32 to shorten the code, and also updates the API from #30 to simplify their embedding into the existing tests without too many conversions

For the docs:

• Reference the new features from README
• Add page for the Go WireMock client
• Add analytics links for wiremock.org where we try to get more insights on how the testcontainers are faring

FYI @walkerus @Vayras

Submitter checklist

• The PR request is well described and justified, including the body and the references
• The PR title represents the desired changelog entry
• The repository's code style is followed (see the contributing guide)
• Test coverage that demonstrates that the change works as expected
• For new features, there's necessary documentation in this pull request or in a subsequent PR to wiremock.org

[oleg-nenashev]

@walkerus this file was not included. I normally include go.mod so that we have a kind of SBOM for commit tags, but would appreciate your opinion whether we want it

[walkerus]

Yes, of course, it should be included in the version control system, it looks like I forgot to do it