feat(callbacks): Callbacks can edit messages

[njbrake]

@daavoo before I get too deep into this PR, would you be able to give a quick look to make sure it aligns with what you were thinking too? I'm 90% sure it does, but want to check in before I go through the trouble of implementing it for all the frameworks

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/any_agent/callbacks/context.py	61.90%	8 Missing ⚠️
src/any_agent/callbacks/wrappers/tinyagent.py	55.55%	3 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
src/any_agent/callbacks/__init__.py	100.00% <100.00%> (ø)
src/any_agent/frameworks/any_agent.py	83.12% <100.00%> (-7.50%)	⬇️
src/any_agent/callbacks/wrappers/tinyagent.py	92.59% <55.55%> (-7.41%)	⬇️
src/any_agent/callbacks/context.py	74.19% <61.90%> (-25.81%)	⬇️

... and 46 files with indirect coverage changes

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[daavoo]

@daavoo before I get too deep into this PR, would you be able to give a quick look to make sure it aligns with what you were thinking too? I'm 90% sure it does, but want to check in before I go through the trouble of implementing it for all the frameworks

You're cooking, looks good to me