Add support for various debian source files (debian/{tests/control,control,copyright,watch,upstream/metadata}) (#5107)

* Add debian-lsp support for autopkgtest files

Add Language Server Protocol support for debian/tests/control files
using debian-lsp (https://github.com/jelmer/debian-lsp).

Vim detects these files as filetype 'autopkgtest' by default.

* Add debian-lsp support for debcontrol files

Add Language Server Protocol support for debian/control files using
debian-lsp (https://github.com/jelmer/debian-lsp).

debian-lsp provides diagnostics, completions, and code actions for
Debian package control files.

* Add debian-lsp support for debcopyright files

Add Language Server Protocol support for debian/copyright files using
debian-lsp (https://github.com/jelmer/debian-lsp).

* Add debian-lsp support for debchangelog files

Add Language Server Protocol support for debian/changelog files using
debian-lsp (https://github.com/jelmer/debian-lsp).

* Add debian-lsp support for debsources files

Add Language Server Protocol support for debian/source/format files
using debian-lsp (https://github.com/jelmer/debian-lsp).

* Add debian-lsp support for debupstream files

Add Language Server Protocol support for debian/upstream/metadata
files using debian-lsp (https://github.com/jelmer/debian-lsp).

Note: Vim does not detect debian/upstream/metadata files by default.
Users need to add filetype detection to their vimrc:

  autocmd BufNewFile,BufRead */debian/upstream/metadata setfiletype debupstream

* Add debian-lsp support for debwatch files

Add Language Server Protocol support for debian/watch files using
debian-lsp (https://github.com/jelmer/debian-lsp).

Note: Vim does not detect debian/watch files by default. Users need to
add filetype detection to their vimrc:

  autocmd BufNewFile,BufRead */debian/watch setfiletype debwatch

* Add debian-lsp to supported tools documentation

Update supported-tools.md, ale-supported-languages-and-tools.txt,
and ale.txt table of contents to include the new Debian filetype
linters (autopkgtest, debchangelog, debcontrol, debcopyright,
debsources, debupstream, debwatch).

doc/ale.txt

@@ -3436,6 +3436,8 @@ documented in additional help files.
   astro...................................|ale-astro-options|
     eslint................................|ale-astro-eslint|
     prettier..............................|ale-astro-prettier|
+  autopkgtest.............................|ale-autopkgtest-options|
+    debian-lsp............................|ale-autopkgtest-debian-lsp|
   avra....................................|ale-avra-options|
     avra..................................|ale-avra-avra|
   awk.....................................|ale-awk-options|
@@ -3530,6 +3532,18 @@ documented in additional help files.
     dart-analyze..........................|ale-dart-analyze|
     dart-format...........................|ale-dart-format|
     dartfmt...............................|ale-dart-dartfmt|
+  debian changelog........................|ale-debchangelog-options|
+    debian-lsp............................|ale-debchangelog-debian-lsp|
+  debian control..........................|ale-debcontrol-options|
+    debian-lsp............................|ale-debcontrol-debian-lsp|
+  debian copyright........................|ale-debcopyright-options|
+    debian-lsp............................|ale-debcopyright-debian-lsp|
+  debian sources..........................|ale-debsources-options|
+    debian-lsp............................|ale-debsources-debian-lsp|
+  debian upstream metadata................|ale-debupstream-options|
+    debian-lsp............................|ale-debupstream-debian-lsp|
+  debian watch............................|ale-debwatch-options|
+    debian-lsp............................|ale-debwatch-debian-lsp|
   desktop.................................|ale-desktop-options|
     desktop-file-validate.................|ale-desktop-desktop-file-validate|
   dhall...................................|ale-dhall-options|