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/packages/util.py

@@ -115,14 +115,6 @@ def get_pkgbase_comment(pkgbase: models.PackageBase, id: int) \
     return db.refresh(comment)
 
 
-def get_pkgreq_by_id(id: int):
-    pkgreq = db.query(models.PackageRequest).filter(
-        models.PackageRequest.ID == id).first()
-    if not pkgreq:
-        raise HTTPException(status_code=HTTPStatus.NOT_FOUND)
-    return db.refresh(pkgreq)
-
-
 @register_filter("out_of_date")
 def out_of_date(packages: orm.Query) -> orm.Query:
     return packages.filter(models.PackageBase.OutOfDateTS.isnot(None))