feat(crewai): initial instrumentation; collect agent and task traces

[adharshctr]

• I have added tests that cover my changes.
• If adding a new instrumentation or changing an existing one, I've added screenshots from some observability platform showing the change.
• PR name follows conventional commits format: feat(instrumentation): ... or fix(instrumentation): ....
• (If applicable) I have updated the documentation accordingly.

[adharshctr]

@nirga For my previous PR, i got some issue while resolving conflits. So i have to close that PR.
I have updated with the changes that you have suggested in my previous PR. Kindly review it. TIA!

[gyliu513]

@adharshctr some tips for how to resolve conflict for some PRs:

How to resolve conflict: If git rebase has some conflict, then we need to resolve conflict as following:

Update files to resolve conflict

git add .

git rebase --continue

git commit --amend

[adharshctr]

@adharshctr some tips for how to resolve conflict for some PRs:

How to resolve conflict: If git rebase has some conflict, then we need to resolve conflict as following:

Update files to resolve conflict

git add .

git rebase --continue

git commit --amend

Thank you

[gyliu513]

Fixed #2339