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- refactor: the codebase to use `substr` instead of `range`.
- refactor: CMake targets.
- refactor: add bazelrc to build using either abseil or std::string STD.
- ci: build and run on windows using CMake and bazel.
- update: add platform support section and update building instructions.

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Usage of std::regex_match was problematic for traceparent with trailing
spaces. The overload use is `std::regex_match(str, str + std::char_traits<CharT>::length(str), m, e, flags)`,
which resolves as the whole input instead of the trimmed input.

Changes:
  - Fix std::regex_match usage.
  - Add unit test.

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Now, sampling remote configuration do not create a new trace sampler
which had the side effect to reset the rate limiter.

- add sampling rules RC support
- fix: report telemetry sampling rules
- fix: report telemetry rps and sample rate for span
- report remote trace sample rate as RULE instead of REMOTE_RULE for legacy reasons
- update REMOTE_RULES and REMOTE_ADAPTIVE_RULE values to match the spec
- report default sample rate for telemetry
- add _dd.psr for new remote rules

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