[FEATURE]: Get SSR working with TanStack Start

[tobySolutions]

One of the current features Tanstack forms needs is to get SSR working with Tanstack Start as it will be a good add-on to ensure seamless server-side form integration bringing the features Tanstack form has to work from the server as well.

More internal details regarding this can be provided by @crutchcorn 🙏 (sorry for the many tags)

[crutchcorn]

Work on this should be temporarily halted until this PR makes it into main:

#734

[crutchcorn]

Work on this has started in the tanstack-start branch

[crutchcorn]

PRs related to this:

• fix: handle formdata correctly from form action router#1815
• fix: add option to include and exclude properties from React plugin router#1840
• fix: Start config now loads properly on Windows router#1851