* Add getPullRequestTemplates method to discover templates

Signed-off-by: Babak K. Shandiz <babak.k.shandiz@gmail.com>

* Add method to quick pick for PR templates

Signed-off-by: Babak K. Shandiz <babak.k.shandiz@gmail.com>

* Handle possible PR templates

Signed-off-by: Babak K. Shandiz <babak.k.shandiz@gmail.com>

* Remove unnecessary return value assignment

Co-authored-by: João Moreno <mail@joaomoreno.com>

* Change comparison operands' order

Co-authored-by: João Moreno <mail@joaomoreno.com>

* Remove sorting template URIs in pickPullRequestTemplate

Signed-off-by: Babak K. Shandiz <babak.k.shandiz@gmail.com>

* Sort template URIs before showing quick-pick list

Signed-off-by: Babak K. Shandiz <babak.k.shandiz@gmail.com>

* Rename getPullRequestTemplates method to findPullRequestTemplates

Signed-off-by: Babak K. Shandiz <babak.k.shandiz@gmail.com>

* Find Github PR templates in-parallel using read...