Hooks added to the base event class

[mukundkumarjha]

Why are these changes needed?

Related issue number

Fixes #2066

Checks

• I've included any doc changes needed for https://docs.ag2.ai/. See https://docs.ag2.ai/latest/docs/contributor-guide/documentation/ to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
autogen/events/base_event.py	91.37% <100.00%> (+1.79%)	⬆️

... and 37 files with indirect coverage changes

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