feat(providers): add session support for ACP

[xjacka]

Description

Supports session for ACP client.

Checklist

General

• [x] I have read the appropriate contributor guide: Python / TypeScript
• [x] I have signed off on my commit: Python instructions / TypeScript instructions
• [x] Commit messages and PR title follow conventional commits
• [x] Appropriate label(s) added to PR: Python for Python changes, TypeScript for TypeScript changes

Code quality checks

• [x] Linting passes: Python poe lint or poe lint --fix / TypeScript yarn lint or yarn lint:fix
• [x] Formatting is applied: Python poe format or poe format --fix / TypeScript: yarn format or yarn format:fix
• [x] Static type checks pass: Python poe type-check

Testing

• [x] Unit tests pass: Python poe test --type unit / TypeScript yarn test:unit
• [ ] E2E tests pass: Python poe test --type e2e / TypeScript: yarn test:e2e
• [ ] Integration tests pass: Python poe test --type integration
• [ ] Tests are included (for bug fixes or new features)

Documentation

• [x] Documentation is updated
• [x] Embedme embeds code examples in docs. To update after edits, run: Python poe docs --type build