Convert @redwoodjs/web to TypeScript

[peterp]

The current package has type definitions contributed by @burnsy, but we would like to convert the entire package to TypeScript.

• Convert project to transpile TS and JS files. @peterp Make "@redwoodjs/web" TypeScript ready #1232
• Convert RedwoodProvider(in progress 🥮 @redwood/web typing: Add types to RedwoodProvider #1291)
• Convert FatalErrorBoundary(in progress converted FatalErrorBoundary to typescript #1273)
• Convert createGraphQLClient
• Convert GraphQLProvider
• Convert FlashComponent (in progress Convert most of the remaining code to Typescript #1312)
• Convert src/packages/web/config.js (in progress Convert most of the remaining code to Typescript #1312)
• Remove allowJs from tsconfig in web package.

/cc @kimadeline

[BurnedChris]

Maybe flash should be it's onwn module as it can be quite useful without the forms. 😌 ie for notifications.

[peterp]

@burnsy It's so difficult to strike a balance here, maybe we can just keep it in.

[thedavidprice]

TeamTS FTW 🚀

[peterp]

Whoops, we need to open this again, since we need to convert the Flash component.

[Krisztiaan]

#1824 is done for the flash component. #1312 is not relevant anymore.

[Krisztiaan]

#1641 resolved "Convert src/packages/web/config.js"