feat: add --experiments flag to replace --experimental (#5767)

- Deprecates the --experimental flag
- Adds a new flag --experiments which supports passing multiple comma-separated values or a wildcard value.
- Exposes a new endpoint /api/v2/experiments that returns the list of enabled experiments.
- Deprecates the field Features.Experimental in favour of this new API.
- Updates apidocgen to support type aliases (shoutout to @mtojek).
- Modifies apitypings to support generating slice types.
- Updates develop.sh to pass additional args after -- to $CODERD_SHIM.

site/src/testHelpers/entities.ts

@@ -982,6 +982,8 @@ export const MockEntitlementsWithAuditLog: TypesGen.Entitlements = {
   }),
 }
 
+export const MockExperiments: TypesGen.Experiment[] = ["vscode_local"]
+
 export const MockAuditLog: TypesGen.AuditLog = {
   id: "fbd2116a-8961-4954-87ae-e4575bd29ce0",
   request_id: "53bded77-7b9d-4e82-8771-991a34d759f9",

site/src/testHelpers/handlers.ts

@@ -15,6 +15,11 @@ export const handlers = [
     return res(ctx.status(200), ctx.json(M.MockBuildInfo))
   }),
 
+  // experiments
+  rest.get("/api/v2/experiments", async (req, res, ctx) => {
+    return res(ctx.status(200), ctx.json(M.MockExperiments))
+  }),
+
   // update check
   rest.get("/api/v2/updatecheck", async (req, res, ctx) => {
     return res(ctx.status(200), ctx.json(M.MockUpdateCheck))