feat: Add getInitialSessionAuthContext to compute SessionAuth context

[sasha240100]

Summary of change

Adds getInitialSessionAuthContext to support computing initial SessionAuth context (to be used with initialSessionAuthContext property from https://github.com/supertokens/supertokens-auth-react/pull/789)

Related issues

• https://github.com/supertokens/supertokens-auth-react/issues/790
• https://github.com/supertokens/supertokens-auth-react/pull/789

Test Plan

Tested locally on a NextJS implementation using supertokens. getInitialSessionAuthContext(session) creates an SSR session context that works like expected when passed into initialSessionAuthContext={} of <SessionAuth /> component. Also covered by unit tests

Documentation changes

TODO.

(If relevant, please create a PR in our docs repo, or create a checklist here highlighting the necessary changes)

Checklist for important updates

• [ ] Changelog has been updated
• [ ] coreDriverInterfaceSupported.json file has been updated (if needed)
  • Along with the associated array in lib/ts/version.ts
• [ ] frontendDriverInterfaceSupported.json file has been updated (if needed)
• [ ] Changes to the version if needed
  • In package.json
  • In package-lock.json
  • In lib/ts/version.ts
• [x] Had run npm run build-pretty
• [x] Had installed and ran the pre-commit hook
• [ ] If new thirdparty provider is added,
  • [ ] update switch statement in recipe/thirdparty/providers/configUtils.ts file, createProvider function.
  • [ ] add an icon on the user management dashboard.
• [ ] Issue this PR against the latest non released version branch.
  • To know which one it is, run find the latest released tag (git tag) in the format vX.Y.Z, and then find the latest branch (git branch --all) whose X.Y is greater than the latest released tag.
  • If no such branch exists, then create one from the latest released branch.
• [ ] If have added a new web framework, update the add-ts-no-check.js file to include that
• [ ] If added a new recipe / api interface, then make sure that the implementation of it uses NON arrow functions only (like someFunc: function () {..}).
• [ ] If added a new recipe, then make sure to expose it inside the recipe folder present in the root of this repo. We also need to expose its types.

Remaining TODOs for this PR

• [ ] Add to documentation

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