Add support to open git repository with branch

[LinuxSuRen]

Description

As I mentioned in the title.

Related Issue(s)

Fixes #

How to test

These my test steps and output:

➜  goget git:(support-pkg-set) GITHUBURL=$(gh browse --no-browser --branch $(git branch --show-current))
➜  goget git:(support-pkg-set) echo $GITHUBURL                                                          
https://github.com/LinuxSuRen/goget/tree/support-pkg-set/

Release Notes

Add support to open git repository with branch

Documentation

[LinuxSuRen]

A similar extension for opening repo in Codespaces.

See https://github.dev///LinuxSuRen/gh-dev/tree/master/