Update copyright for the remaining repo

[ThomsonTan]

This added copyright header for all files based on below 3 PRs.

#1960
#1961
#1962

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

[codecov]

Codecov Report

Merging #1963 (c07d0e0) into main (1d18614) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1963   +/-   ##
=======================================
  Coverage   87.12%   87.12%           
=======================================
  Files         165      165           
  Lines        4596     4596           
=======================================
  Hits         4004     4004           
  Misses        592      592           

[lalitb]

Thanks. There is overlap with some of the PRs raised by @marcalff, Should we merge all his PRs first, and then take the left-over changes from this PR ? Or if there is better suggestion.

[marcalff]

LGTM, thanks for the cleanup