module: add :completion corfu

This commit's primary goal is allowing use of
[minad/corfu](https://github.com/minad/corfu) as an alternative to
[company](https://github.com/company-mode/company-mode). It introduces a
module under :completion for this purpose, plus some conditionals on
other relevant modules to toggle functionality like lsp back-ends and
[minad/cape](https://github.com/minad/cape) capfs for certain modes.

Other optional or miscellaneous features include:

- Support for displaying the completion's documentation on a secondary
  popup;
- Support for terminal display if :os tty;
- Support for icons if +icons;
- Support for tab-and-go completion if +tng;

modules/completion/vertico/packages.el

@@ -6,7 +6,7 @@
            :files ("*.el" "extensions/*.el"))
   :pin "a28370d07f35c5387c7a9ec2e5b67f0d4598058d")
 
-(package! orderless :pin "e6784026717a8a6a7dcd0bf31fd3414f148c542e")
+(package! orderless :pin "b24748093b00b37c3a572c4909f61c08fa27504f")
 
 (package! consult :pin "fe49dedd71802ff97be7b89f1ec4bd61b98c2b13")
 (package! consult-dir :pin "ed8f0874d26f10f5c5b181ab9f2cf4107df8a0eb")