feat!: return boolean success value from setGlobalXXX methods

[dyladan]

Fixes #31

[codecov]

Codecov Report

Merging #32 (61a6015) into main (9df5ef8) will decrease coverage by 0.03%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
- Coverage   94.64%   94.61%   -0.04%     
==========================================
  Files          39       39              
  Lines         504      501       -3     
  Branches       81       81              
==========================================
- Hits          477      474       -3     
  Misses         27       27              

Impacted Files	Coverage Δ
src/internal/global-utils.ts	90.62% <66.66%> (+0.30%)	⬆️
src/api/context.ts	96.15% <100.00%> (-0.28%)	⬇️
src/api/diag.ts	100.00% <100.00%> (ø)
src/api/propagation.ts	100.00% <100.00%> (ø)
src/api/trace.ts	95.65% <100.00%> (-0.19%)	⬇️

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[obecny]

it would be a breaking change :/ although I think this is the last chance we can really do it.