Add forms API

[nksaraf]

This introduces a new Form API for SolidStart. Will document it more, but I've demoed it before. It's essentially a createForm that takes an async function and returns a form you can render

Some size numbers:

// client mode SPA
dist/assets/_...stories_.e7092512.js   2.54 KiB / gzip: 0.89 KiB
dist/assets/_id_.1845bf77.js           2.24 KiB / gzip: 0.88 KiB
dist/assets/_id_.3b38f1ff.js           1.33 KiB / gzip: 0.59 KiB
dist/assets/index.fb42bad5.css         3.97 KiB / gzip: 1.28 KiB
dist/assets/index.4b06b870.js          29.20 KiB / gzip: 11.24 KiB

// without server side api, fetching on the client
dist/assets/_id_.77f41271.js            2.77 KiB / gzip: 1.02 KiB
dist/assets/entry-client.ef96127c.css   3.97 KiB / gzip: 1.28 KiB
dist/assets/_id_.d8aa775f.js            1.50 KiB / gzip: 0.67 KiB
dist/assets/_...stories_.b6819e6e.js    3.03 KiB / gzip: 1.03 KiB
dist/assets/entry-client.538286bb.js    29.74 KiB / gzip: 11.38 KiB

// with server side API, without redirect/forms
dist/assets/_id_.d8c75572.js            2.77 KiB / gzip: 1.02 KiB
dist/assets/_...stories_.8a56c3f8.js    3.03 KiB / gzip: 1.03 KiB
dist/assets/entry-client.ef96127c.css   3.97 KiB / gzip: 1.28 KiB
dist/assets/_id_.6f98f8bb.js            1.50 KiB / gzip: 0.67 KiB
dist/assets/entry-client.15481405.js    30.33 KiB / gzip: 11.65 KiB

// with server side api, redirects, forms, errors, returned/thrown responses
dist/assets/_...stories_.c8d32dcf.js    3.03 KiB / gzip: 1.02 KiB
dist/assets/_id_.7325f45b.js            2.77 KiB / gzip: 1.02 KiB
dist/assets/_id_.ec28dae0.js            1.50 KiB / gzip: 0.66 KiB
dist/assets/entry-client.ef96127c.css   3.97 KiB / gzip: 1.28 KiB
dist/assets/entry-client.87d12dfe.js    31.48 KiB / gzip: 12.00 KiB

[atk]

Typo: messasge -> message

[ryansolid]

Yes. This looks good.. Thank you so much for this one.