[BFCL] Add gemini-1.5-pro-002, gemini-1.5-pro-002-FC, gemini-1.5-pro-001, gemini-1.5-pro-001-FC, gemini-1.5-flash-002, gemini-1.5-flash-002-FC, gemini-1.0-pro-002, gemini-1.0-pro-002-FC

[HuanzhiMao]

This PR adds the following new models to the leaderboard:

• gemini-1.5-pro-002
• gemini-1.5-pro-002-FC
• gemini-1.5-pro-001
• gemini-1.5-pro-001-FC
• gemini-1.5-flash-002
• gemini-1.5-flash-002-FC
• gemini-1.0-pro-002
• gemini-1.0-pro-002-FC

Note: All the code for Gemini prompting series inference are already written out in #644, but they were not thoroughly verified at that time due to limited bandwidth. This PR has the code tested and thus we 'officially' add support for the prompting version of the Gemini models.

[HuanzhiMao]

Update: Add gemini-1.5-pro-002 and gemini-1.5-pro-002_FC in this PR as well.

[HuanzhiMao]

Hey @vandyxiaowei, would you mind taking a look at this PR? The Vertex AI library is a bit tricky to deal with, and I want to make sure I didn't mess up stuff. Thanks!