feat: git clone completions (#856)

Adds completions for the `git clone` command

custom-completions/git/git-completions.nu

@@ -595,4 +595,46 @@ export extern "git worktree remove" [
 # allow working tree to be pruned, moved or deleted
 export extern "git worktree unlock" [
  ...args
+]
+
+# clones a repo
+export extern "git clone" [
+ --help(-h) # display the help message for this command
+ --local(-l) # cloning from the local machine
+ --no-local # use the git transport mechanism even if cloning from a local path
+ --no-hardlinks # force git to copy files when cloning from the local machine
+ --shared(-s) # setup .git/objects/info/alternates to share objects with the source local repo
+ --reference: string # setup .git/objects/info/alternates to share objects with the =<reference> local repo
+ --reference-if-able: string # same as --reference, but skips empty folders
+ --dissociate # borrow objects from the referenced repo (--reference)
+ --quiet(-q) # suppress progress reporting
+ --verbose(-v) # be verbose
+ --progress # report progress unless --quiet
+ --server-option: string # transmit the =<option> to the server
+ --no-checkout(-n) # no checkout of HEAD
+ --reject-shallow # reject shallow repository as source
+ --no-reject-shallow # do not reject shallow repository as source
+ --bare # make a bare git repo
+ --sparse # initialize the sparse-checkout file
+ --filter: string # partial clone using the given =<filter-spec>
+ --mirror # mirror the source repo
+ --origin(-o): string # use <name> as the name for the remote origin
+ --branch(-b): string # point HEAD to <name> branch
+ --upload-pack(-u): string # use <upload-pack> as the path in the other end when using ssh
+ --template: string # use <template-dir> as the templates directory
+ --config(-c): string # set a <key>=<value> config variable
+ --depth: int # shallow clone <depth> commits 
+ --shallow-since: string # shallow clone commits newer than =<date>
+ --shallow-exclude: string # do not clone commits reachable from <revision> (branch or tag)
+ --single-branch # clone commit history from a single branch
+ --no-single-Branch # do not clone only one branch
+ --no-tags # do not clone any tags
+ --recurse-submodules: string # clone the submodules
+ --shallow-submodules # shallow clone submodules with depth 1
+ --no-shallow-submodules # do not shallow clone submodules
+ --remote-submodules # submodules are updating using their remote tracking branch
+ --no-remote-submodules # do not track submodules remote
+ --separate-git-dir: string # place the clone at =<git dir> and link it here
+ --jobs(-j): int # number of simultaneous submodules fetch
+ ...args
 ]