Function Calling Support for Gemini - Part 2

[luxzoli]

Why are these changes needed?

Finalize the Gemini function calling PR #2793 from @arjun-g, plus include support for VertexAI tool config for function calling.

Related issue number

Relates to #2387

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#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.

[gitguardian]

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GitGuardian id	GitGuardian status	Secret	Commit	Filename
12853598	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
10404693	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
12853599	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
10404694	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
12853601	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
12853602	Triggered	Generic High Entropy Secret	64af078	test/oai/test_utils.py	View secret
11616921	Triggered	Generic High Entropy Secret	6563248	notebook/agentchat_agentops.ipynb	View secret

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[ekzhu]

Looks fine with me though we cannot test Gemini in our CI.

[ekzhu]

@luxzoli Thanks! A couple of tests are failing in CI.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.97368% with 149 lines in your changes missing coverage. Please review.

Please upload report for BASE (0.2@3ebd7ae). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
autogen/oai/gemini.py	1.97%	149 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             0.2    #3726   +/-   ##
======================================
  Coverage       ?   29.15%           
======================================
  Files          ?      115           
  Lines          ?    12813           
  Branches       ?     2431           
======================================
  Hits           ?     3735           
  Misses         ?     8733           
  Partials       ?      345           

Flag	Coverage Δ
unittests	29.15% <1.97%> (?)

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[luxzoli]

@ekzhu should I prepare a new PR with the updated costs? They are slightly different now for Gemini 1.5 Pro and Gemini 1.5 Flash