feat: session expiration improvements

[jakehobbs]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
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PR-Codex overview

This PR focuses on enhancing the session management and configuration for the account-kit library. It introduces a new sessionConfig object, updates documentation, and modifies test cases to reflect changes in session length handling.

Detailed summary

• Added environment: "jsdom" in vitest.config.ts.
• Updated sessionLength description in documentation to indicate deprecation.
• Introduced CreateStorageFn type for storage configuration.
• Replaced inline storage configuration with CreateStorageFn in CreateConfigProps.
• Added tests for createConfig to verify session length and expiration time.
• Updated SessionManager tests to check expiration time configuration.
• Added sessionConfig option to override default session manager config in quickstart.mdx.
• Deprecated sessionLength in cookieStorage function and updated its documentation.
• Introduced MAX_COOKIE_DURATION_MS constant for cookie duration limits.

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