feat(FastAPI): add pkgbase comments (new, edit)

In PHP, this was implemented using an /rpc type 'get-comment-form'.
With FastAPI, we've decided to reorganize this into a non-RPC route:
`/pkgbase/{name}/comments/{id}/form`, rendered via the new
`templates/partials/packages/comment_form.html` template.

When the comment_form.html template is provided a `comment` object,
it will produce an edit comment form. Otherwise, it will produce a new
comment form.

A few new FastAPI routes have been introduced:

- GET `/pkgbase/{name}/comments/{id}/form`
    - Produces a JSON response based on {"form": "<form_markup>"}.
- POST `/pkgbase/{name}/comments'
    - Creates a new comment.
- POST `/pkgbase/{name}/comments/{id}`
    - Edits an existing comment.

In addition, some Javascript has been modified for our new routes.

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

aurweb/packages/util.py

@@ -11,6 +11,7 @@ from aurweb import db
 from aurweb.models.official_provider import OFFICIAL_BASE, OfficialProvider
 from aurweb.models.package import Package
 from aurweb.models.package_base import PackageBase
+from aurweb.models.package_comment import PackageComment
 from aurweb.models.package_dependency import PackageDependency
 from aurweb.models.package_notification import PackageNotification
 from aurweb.models.package_relation import PackageRelation
@@ -121,6 +122,13 @@ def get_pkg_or_base(name: str, cls: Union[Package, PackageBase] = PackageBase):
     return instance
 
 
+def get_pkgbase_comment(pkgbase: PackageBase, id: int) -> PackageComment:
+    comment = pkgbase.comments.filter(PackageComment.ID == id).first()
+    if not comment:
+        raise HTTPException(status_code=int(HTTPStatus.NOT_FOUND))
+    return comment
+
+
 @register_filter("out_of_date")
 def out_of_date(packages: orm.Query) -> orm.Query:
     return packages.filter(PackageBase.OutOfDateTS.isnot(None))