feat: Add license header scripts to validate and add license to codebase

[flacatus]

This PR create a new tool to check license header in codebase and add new license.

Refference issue: eclipse-che/che#19647

[codecov]

Codecov Report

Merging #166 (58cfd70) into main (18eec93) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #166   +/-   ##
=======================================
  Coverage   44.77%   44.77%           
=======================================
  Files          13       13           
  Lines         440      440           
=======================================
  Hits          197      197           
  Misses        240      240           
  Partials        3        3           

Impacted Files	Coverage Δ
exec/activity-connection-saver.go	0.00% <ø> (ø)
exec/command_resolver.go	87.50% <ø> (ø)
exec/exec-manager-provider.go	0.00% <ø> (ø)
exec/health-watcher.go	100.00% <ø> (ø)
exec/kubernetes_exec_manager.go	0.00% <ø> (ø)
exec/namespace_provider.go	0.00% <ø> (ø)
exec/pty_handler.go	0.00% <ø> (ø)
filter/kubernetes_filter.go	60.60% <ø> (ø)
output/line-buffer/line_ringe_buffer.go	100.00% <ø> (ø)
output/line-buffer/line_scanner.go	100.00% <ø> (ø)
... and 3 more

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[l0rd]

@flacatus as a minor comment: this looks more like a chore rather than a feat