change(python): move request & pkgbase request routes

Move package request routes and related routes to their
respective routers. In addition, move some utility used
for requests over from `aurweb.packages`.

Introduced routers:
- `aurweb.routers.requests`

Introduced package:
- `aurweb.requests`

Introduced module:
- `aurweb.requests.util`

Changes:
- Moved `aurweb.packages.validate` to `aurweb.pkgbase.validate`
- Moved requests listing & request closure routes to
  `aurweb.routers.requests`
- Moved pkgbase request creation route to `aurweb.routers.pkgbase`
- Moved `get_pkgreq_by_id` from `aurweb.packages.util` to
  `aurweb.requests.util` and fixed its return type hint.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/asgi.py

@@ -21,7 +21,7 @@ from aurweb.auth import BasicAuthBackend
 from aurweb.db import get_engine, query
 from aurweb.models import AcceptedTerm, Term
 from aurweb.prometheus import http_api_requests_total, http_requests_total, instrumentator
-from aurweb.routers import accounts, auth, html, packages, pkgbase, rpc, rss, sso, trusted_user
+from aurweb.routers import accounts, auth, html, packages, pkgbase, requests, rpc, rss, sso, trusted_user
 from aurweb.templates import make_context, render_template
 
 # Setup the FastAPI app.
@@ -82,6 +82,7 @@ async def app_startup():
     app.include_router(rss.router)
     app.include_router(packages.router)
     app.include_router(pkgbase.router)
+    app.include_router(requests.router)
     app.include_router(rpc.router)
 
     # Initialize the database engine and ORM.