Updating experimental GRPC module

[olegbespalov]

What?

This brings changes (see related PRs) from the xk6-grpc:

• Ommiting EOF for the send
• Backporting of Fix for the registering nested types
• Backporting of Support for per-vu TLS configuration
• Non-significant changes

Why?

With the k6 v0.46 we also want to ship updates to the experimental GRPC module.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make ci-like-lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

• fix: omit reporting EOF errors xk6-grpc#19
• fix for registering nested message types xk6-grpc#23
• Contributing xk6-grpc#24
• This is a port of the PR changes found here: xk6-grpc#25
• Update golangci-linter & apply linter fixes xk6-grpc#26

[codecov-commenter]

Codecov Report

Merging #3211 (3d7e678) into master (dccdf16) will decrease coverage by 0.07%.
The diff coverage is n/a.

❗ Current head 3d7e678 differs from pull request most recent head b04c28c. Consider uploading reports for the commit b04c28c to get more accurate results

@@            Coverage Diff             @@
##           master    #3211      +/-   ##
==========================================
- Coverage   72.89%   72.82%   -0.07%     
==========================================
  Files         259      257       -2     
  Lines       19810    19805       -5     
==========================================
- Hits        14440    14423      -17     
- Misses       4470     4477       +7     
- Partials      900      905       +5     

Flag	Coverage Δ
ubuntu	72.82% <ø> (-0.02%)	⬇️
windows	?

Flags with carried forward coverage won't be shown. Click here to find out more.

see 8 files with indirect coverage changes