Adding Copyright Holders

[hdost]

Using the Copyright holder of "The OpenTelemetry Authors" as recommended.

• Update the LICENSE Files Per the CNCF Guidelines: https://github.com/cncf/foundation/blob/main/copyright-notices.md#copyright-notices
• Add authors to Cargo.toml
  • Was already existing in opentelemetry-proto, so followed the same email format.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.3 ⚠️

Comparison is base (e773f92) 50.7% compared to head (bbeb1fc) 50.5%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1112     +/-   ##
=======================================
- Coverage   50.7%   50.5%   -0.3%     
=======================================
  Files        165     168      +3     
  Lines      19808   19893     +85     
=======================================
+ Hits       10059   10060      +1     
- Misses      9749    9833     +84     

see 6 files with indirect coverage changes

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