Add useProcedure React hook and export procedures from codegen

[DexterKoelson]

Closes #4751

Description of Changes

• Add useProcedure React hook that mirrors useReducer which returns a stable, typed callback that queues calls until the connection is ready
• Add ProcedureParamsType and ProcedureReturnType utility types to type_utils.ts
• Update TypeScript codegen to emit export const procedures = __convertToAccessorMap(proceduresSchema.procedures) in generated module bindings, matching the existing pattern for reducers

import { procedures } from './module_bindings';
import { useProcedure } from 'spacetimedb/react';

const doSomeThing = useProcedure(procedures.doSomeThing);
const result = await doSomeThing({ foo: "..." });

API and ABI breaking changes

None. Additive only — new hook export and new codegen line.

Expected complexity level and risk

Low. The hook is a near-copy of useReducer adapted for procedure signatures. The codegen change adds one line following the identical pattern used for reducers.

Testing

• TypeScript SDK compiles with no new errors (tsc --noEmit)
• All 170 existing tests pass (17 test files)
• Tested end-to-end in a React app calling a procedure