Change license to Apache 2.0

[demirkayaender]

Detailed Description
Changing our license to Apache 2.0 to be consistent across our org.

Impact Analysis

• Backward Compatibility: No impact expected
• Forward Compatibility: No impact expected

Testing Plan

• Unit Tests: Shouldn't be needed.
• Persistence Tests: Shouldn't be needed.
• Integration Tests: Shouldn't be needed.
• Compatibility Tests: Shouldn't be needed.

Rollout Plan
Shouldn't have any impact in any of the following questions

• What is the rollout plan?
• Does the order of deployment matter?
• Is it safe to rollback? Does the order of rollback matter?
• Is there a kill switch to mitigate the impact immediately?

[Groxx]

Yea, looks good and I'm pretty sure that'll pass CI 👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.70%. Comparing base (dd7df58) to head (ad66506).
Report is 1 commits behind head on master.

Files with missing lines	Coverage Δ
internal/activity.go	89.71% <ø> (ø)
internal/encoded.go	79.31% <ø> (ø)
internal/internal_public.go	100.00% <ø> (ø)
internal/internal_task_pollers.go	83.28% <ø> (ø)
internal/internal_workflow_client.go	89.37% <ø> (ø)

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