dynamic_modules: scaffolds Rust SDK

[mathetake]

Commit Message: dynamic_modules: scaffolds Rust SDK Additional Description: This scaffolds the Rust SDK of dynamic modules. Note that abi.h is hard-copied into the directory in order to allow off-tree development of modules.

Risk Level: Testing: Docs Changes: Release Notes: Platform Specific Features: [Optional Runtime guard:] [Optional Fixes #Issue] [Optional Fixes commit #PR or SHA] [Optional Deprecated:] [Optional API Considerations:]

Still WIP

[repokitteh-read-only[bot]]

As a reminder, PRs marked as draft will not be automatically assigned reviewers, or be handled by maintainer-oncall triage.

Please mark your PR as ready when you want it to be reviewed!

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/35887 was opened by mathetake.

see: more, trace.

[repokitteh-read-only[bot]]

CC @envoyproxy/dependency-shepherds: Your approval is needed for changes made to (bazel/.*repos.*\.bzl)|(bazel/dependency_imports\.bzl)|(api/bazel/.*\.bzl)|(.*/requirements\.txt)|(.*\.patch). envoyproxy/dependency-shepherds assignee is @moderation

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/35887 was opened by mathetake.

see: more, trace.