feat: support OTEL_LOG_LEVEL environment variable

[dyladan]

Fixes #102

Draft until tests are completed

[codecov[bot]]

Codecov Report

Merging #143 (261773a) into main (b5fd0ed) will decrease coverage by 3.42%. The diff coverage is 36.11%.

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
- Coverage   94.46%   91.04%   -3.43%     
==========================================
  Files          42       44       +2     
  Lines         578      614      +36     
  Branches       94      103       +9     
==========================================
+ Hits          546      559      +13     
- Misses         32       55      +23     

Impacted Files	Coverage Δ
src/api/diag.ts	66.66% <15.38%> (-33.34%)	:arrow_down:
src/platform/browser/env.ts	83.33% <83.33%> (ø)
src/platform/browser/index.ts	100.00% <100.00%> (ø)
src/platform/node/env.ts	100.00% <100.00%> (ø)
src/platform/node/index.ts	100.00% <100.00%> (ø)

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