This issue is to implement the command necessary to create repository autolinks as discussed within #9420 underneath gh repo autolink.

This should follow similar form as existing GitHub CLI commands as well as necessary tests.

cc: @hoffm @nitrocode

Acceptance Criteria

When I run gh repo autolink create --help
Then I see an informative help usage containing descriptive command information:

1. Long description explaining command purpose

2. Usage: gh repo autolink create <keyPrefix> <urlTemplate> [flags]

3. Aliases: create commands typically allow new alias

4. Flags:

     -n, --numeric                  Mark autolink as non-alphanumeric

5. Inherited flags:

   INHERITED FLAGS
         --help                     Show help for command
     -R, --repo [HOST/]OWNER/REPO   Select another repository using the [HOST/]OWNER/REPO format

6. Examples

   # Create alphanumeric autolink
   gh repo autolink create "TICKET-" "https://example.com/TICKET?query=<num>"
   
   # Create numeric autolink
   gh repo autolink create "DISCORD-" "https://discord.com/channels/<num>" --numeric

Given I don't have the admin role on the repository
And Given I have a local repository cloned from GitHub
When I run gh repo autolink create <keyPrefix> <urlTemplate>
Then I see an informative error

error creating autolink: HTTP 404: Must have admin rights to Repository. (https://api.github.com/repos/{owner}/{repo}/autolinks)

Given I have the admin role on the repository
And Given I have a local repository cloned from GitHub
When I run gh repo autolink create <keyPrefix> <urlTemplate>
Then I see an informational message confirming the repository autolink was created

✓ Autolink "<keyPrefix>" created in <owner>/<repo>

Given I have the admin role on the repository
And Given I have a remote repository
When I run gh repo autolink create <keyPrefix> <urlTemplate> --repo <owner>/<repo>
Then I see an informational message confirming the repository autolink was created the same as when I have a local repository

Given I have the admin role on the repository
And Given I have a local repository cloned from GitHub
When I run gh repo autolink create <keyPrefix> <urlTemplate>
And When <urlTemplate> does not contain literal <num>
Then I see an informative error explaining <urlTemplate> must contain <num>