[AI] Add live session resumption

[cynthiajoan]

Hey there! So you want to contribute to a Firebase SDK?
Before you file this pull request, please read these guidelines:

Discussion

• Read the contribution guidelines (CONTRIBUTING.md).
• If this has been discussed in an issue, make sure to link to the issue here.
  If not, go file an issue about this before creating a pull request to discuss.

Testing

• Make sure all existing tests in the repository pass after your change.
• If you fixed a bug or added a feature, add a new test to cover your code.

API Changes

• At this time we cannot accept changes that affect the public API. If you'd like to help
  us make Firebase APIs better, please propose your change in a feature request so that we
  can discuss it together.

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[danger-firebase-ios]

	2 Warnings
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)
⚠️	New public headers were added, did you remember to add them to the umbrella header?

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