[SDK] Use OPENTELEMETRY_EXPORT and static local variables

[psx95]

Fixes #3302

Changes

Please provide a brief description of the changes here.

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

[netlify]

✅ Deploy Preview for opentelemetry-cpp-api-docs canceled.

Name	Link
🔨 Latest commit	3894904
🔍 Latest deploy log	https://app.netlify.com/sites/opentelemetry-cpp-api-docs/deploys/67e13dc43b655c0008176737

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.52%. Comparing base (4af490f) to head (3894904).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3314      +/-   ##
==========================================
+ Coverage   89.50%   89.52%   +0.03%     
==========================================
  Files         210      210              
  Lines        6522     6526       +4     
==========================================
+ Hits         5837     5842       +5     
+ Misses        685      684       -1     

Files with missing lines	Coverage Δ
...k/include/opentelemetry/sdk/metrics/meter_config.h	100.00% <ø> (ø)
...dk/include/opentelemetry/sdk/trace/tracer_config.h	100.00% <ø> (ø)
sdk/src/metrics/meter_config.cc	100.00% <100.00%> (ø)
sdk/src/trace/tracer_config.cc	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[owent]

LGTM, but I think we can also export copy constructors and copy assignment operators to reduce dumplicated weak symbols.

[marcalff]

@psx95 We would like to invite you to become an opentelemetry-cpp approver, if you would like to become one.

To do so, please file a PR similar to this one:

• Add Marc Alff in cpp-approvers #1635

[psx95]

@psx95 We would like to invite you to become an opentelemetry-cpp approver, if you would like to become one.

To do so, please file a PR similar to this one:

• Add Marc Alff in cpp-approvers #1635

Thanks Marc, I'd be happy to ! 😄