Rust solutions page

[oleg-nenashev]

Adds https://github.com/LukeMathWalker/wiremock-rs from @LukeMathWalker and https://github.com/beltram/stubr from @beltram to the documentation, and also references the RFE for the Testcontainers Rust module

Screenshots

Submitter checklist

• The PR request is well described and justified, including the body and the references
• The PR title represents the desired changelog entry
• If the change against WireMock 2 functionality (incompatible with WireMock 3),
  it is submitted against the 2.x branch
• The repository's code style is followed (see the contributing guide)

Details: Contributor Guide

[oleg-nenashev]

Will merge it and work on it incrementally. Definitely better than a TODO stub