feat(FastAPI): added /requests (get) route

Introduces `aurweb.defaults` and `aurweb.filters`.

`aurweb.filters` is a location developers can put their additional
Jinja2 filters and/or functions. We should slowly move all of our
filters over here, where it makes sense.

`aurweb.defaults` is a new module which hosts some default constants
and utility functions, starting with offsets (O) and per page values
(PP).

As far as the new GET /requests is concerned, we match up here to
PHP's implementation, with some minor improvements:

Improvements:

* PP on this page is now configurable: 50 (default), 100, or 250.
    * Example: `https://localhost:8444/requests?PP=250`

Modifications:

* The pagination is a bit different, but serves the exact same purpose.
* "Last" no longer goes to an empty page.
    * Closes: https://gitlab.archlinux.org/archlinux/aurweb/-/issues/14

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

setup.cfg

@@ -6,17 +6,22 @@ ignore = E741, W503
 max-line-length = 127
 max-complexity = 10
 
-# aurweb/routers/accounts.py
 #   Ignore some unavoidable flake8 warnings; we know this is against
-#   pycodestyle, but some of the existing codebase uses `I` variables,
+#   PEP8, but some of the existing codebase uses `I` variables,
 #   so specifically silence warnings about it in pre-defined files.
+#
 #   In E741, the 'I', 'O', 'l' are ambiguous variable names.
 #   Our current implementation uses these variables through HTTP
 #   and the FastAPI form specification wants them named as such.
-#   In C901's case, our process_account_form function is way too
-#   complex for PEP (too many if statements). However, we need to
-#   process these anyways, and making it any more complex would
-#   just add confusion to the implementation.
+#
+#   With {W503,W504}, PEP8 does not want us to break lines before
+#   or after a binary operator. We have many scripts that already
+#   do this, so we're ignoring it here.
+ignore = E741, W503, W504
+
+# aurweb/routers/accounts.py
+#   Ignore over-reaching complexity.
+#   TODO: This should actually be addressed so we do not ignore C901.
 #
 # test/test_ssh_pub_key.py
 #   E501 is detected due to our >127 width test constant. Ignore it.
@@ -24,7 +29,7 @@ max-complexity = 10
 #   Anything like this should be questioned.
 #
 per-file-ignores =
-    aurweb/routers/accounts.py:E741,C901
+    aurweb/routers/accounts.py:C901
     test/test_ssh_pub_key.py:E501
     aurweb/routers/packages.py:E741