feat: add branch support for extension installation

    return url

    return url

def install_extension_from_url(dirname, url):

def install_extension_from_url(dirname, branch_name, url):

    check_access()

    check_access()

    assert url, 'No URL specified'

    assert url, 'No URL specified'

    try:

    try:

        shutil.rmtree(tmpdir, True)

        shutil.rmtree(tmpdir, True)

        with git.Repo.clone_from(url, tmpdir) as repo:

        with git.Repo.clone_from(url, tmpdir, branch=branch_name if branch_name else '') as repo:

            repo.remote().fetch()

            repo.remote().fetch()

            for submodule in repo.submodules:

            for submodule in repo.submodules:

                submodule.update()

                submodule.update()

            with gr.TabItem("Install from URL"):

            with gr.TabItem("Install from URL"):

                install_url = gr.Text(label="URL for extension's git repository")

                install_url = gr.Text(label="URL for extension's git repository")

                install_branch = gr.Text(label="Branch name for extension's git repository", placeholder="Leave empty for default branch")

                install_dirname = gr.Text(label="Local directory name", placeholder="Leave empty for auto")

                install_dirname = gr.Text(label="Local directory name", placeholder="Leave empty for auto")

                install_button = gr.Button(value="Install", variant="primary")

                install_button = gr.Button(value="Install", variant="primary")

                install_result = gr.HTML(elem_id="extension_install_result")

                install_result = gr.HTML(elem_id="extension_install_result")

                install_button.click(

                install_button.click(

                    fn=modules.ui.wrap_gradio_call(install_extension_from_url, extra_outputs=[gr.update()]),

                    fn=modules.ui.wrap_gradio_call(install_extension_from_url, extra_outputs=[gr.update()]),

                    inputs=[install_dirname, install_url],

                    inputs=[install_dirname, install_branch, install_url],

                    outputs=[extensions_table, install_result],

                    outputs=[extensions_table, install_result],

                )

                )