feat(trash-cli): add 3rd party fallback completion loader

https://github.com/andreafrancia/trash-cli/blob/dba2afa923f52f916c22eb2ce6de8c61e20e6e4d/README.rst#install-shell-completions

Author: akinomyoga

completions/.gitignore

@@ -430,6 +430,11 @@
 /_todoist
 /_tofu
 /tracepath6
+/_trash
+/_trash-empty
+/_trash-list
+/_trash-put
+/_trash-restore
 /_trivy
 /typeset
 /_upctl

completions/Makefile.am

@@ -1037,6 +1037,11 @@ CLEANFILES = \
 	_todoist \
 	_tofu \
 	tracepath6 \
+	_trash \
+	_trash-empty \
+	_trash-list \
+	_trash-put \
+	_trash-restore \
 	_trivy \
 	typeset \
 	_upctl \
@@ -1359,7 +1364,8 @@ symlinks: $(DATA)
 	$(ss) koji \
 		arm-koji ppc-koji s390-koji sparc-koji
 	$(ss) _keyring \
-		_glances _tldr
+		_glances _tldr _trash _trash-empty _trash-list \
+		_trash-put _trash-restore
 	$(ss) ldapsearch \
 		ldapadd ldapcompare ldapdelete ldapmodify ldapmodrdn \
 		ldappasswd ldapwhoami