Add support for bzlmod

[keith]

This adds support for bzlmod, which is bazel's new dependency resolution system.

Theoretically we could now remove the previous dependency management configuration which required flattening all the dependencies, but I left it here for now for users using old versions of bazel.

Fixes: https://github.com/open-telemetry/opentelemetry-cpp/issues/2334

[keith]

this will probably fail CI with the same issue as https://github.com/open-telemetry/opentelemetry-cpp/pull/2599

[keith]

ok I pushed an update here that seems to fix it at least with c++17, it depends on https://github.com/bazelbuild/bazel-central-registry/pull/1810

[marcalff]

Hi @keith

Could you merge with a recent main to resolve conflicts, and investigate the remaining CI failures for bazel if any ?

Thanks, -- Marc

[keith]

The windows and asan failures here are real.

[keith]

hopefully will be unblocked by https://github.com/open-telemetry/opentelemetry-cpp/pull/2679

[marcalff]

@keith

Now that #2679 is merged, could you update this PR and resolve conflicts ?

Looking to include this in the upcoming release.

Thanks.

[keith]

I think there might still be a grpc ODR issue I have to fix, but we'll see if CI fails

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.67%. Comparing base (497eaf4) to head (44f193b). Report is 79 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2608      +/-   ##
==========================================
+ Coverage   87.12%   87.67%   +0.55%     
==========================================
  Files         200      190      -10     
  Lines        6109     5851     -258     
==========================================
- Hits         5322     5129     -193     
+ Misses        787      722      -65     

see 79 files with indirect coverage changes

[keith]

thanks!