add option to disable async local storage in astro

[samuelstroschein]

Context

The Astro adapter doesn't work when deploying to cloudflare workers.

Serverless environments like Cloudflare workers have no risk of cross request problems. Async Local Storage, which is used to avoid cross request bugs in the Astro adapter, is not needed in those environments and also not available.

Proposal

Add an option to disable AsyncLocalStorage similar to the SvelteKit adapter #163 (comment).

Tasks

• add option in the paraglide astro integration disableAsyncLocalStorage

integrations: [
	paraglide({
		// recommended settings
		project: "./project.inlang",
		outdir: "./src/paraglide",
+       disableAsyncLocalStorage: true
	}),
],

• create a new middleware-no-async-local-storage similar to https://github.com/opral/monorepo/blob/39c013d01e6134fc5ad07818949e260fc815abba/inlang/source-code/paraglide/paraglide-astro/src/middleware.ts#L1-L82 but without relying on async local storage
• use config.disableAsyncLocalStorage in integration.ts to resolve the middleware

export function integration(integrationConfig: {
	project: string
	outdir: string
+   disableAsyncLocalStorage: boolean
}): AstroIntegration {
	return {
		name: "paraglide",
		hooks: {
			"astro:config:setup": async ({ addMiddleware, updateConfig, injectScript }) => {
				//Register the middleware
				addMiddleware({
					order: "pre", //Run before user-defined middleware (why not?)
-					entrypoint: middlewarePath,
+                   entrypoint: disableAsyncLocalStorage ? middlewarePathNoAsyncLocalStorage : middlewarePath
				})

• update documentation to explain that async local storage can be disabled for cloudflare workers