Fix issue #834

[owent]

Signed-off-by: owent admin@owent.net

Fixes #834

Changes

• Pass WITH_ABSEIL by cmake config
• Replace ThrowBadVariantAccess by linking absl::bad_variant_access.
• Add TSAN_OPTIONS=report_atomic_races=0, which is just the same as grpc.

Shall we add a CI job to build and install opentelemetry-cpp, and then try to import components from cmake config?

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #835 (1dc0d10) into main (12946c8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #835   +/-   ##
=======================================
  Coverage   95.50%   95.50%           
=======================================
  Files         156      156           
  Lines        6619     6619           
=======================================
  Hits         6321     6321           
  Misses        298      298           

Impacted Files	Coverage Δ
api/include/opentelemetry/nostd/variant.h	66.67% <ø> (ø)
...ude/opentelemetry/sdk/trace/multi_span_processor.h	93.34% <100.00%> (ø)

[maxgolov]

LGTM. Thank you! Maybe we'd need to add some CI for that (in a separate PR).