Feature: add xontext to builtin aliases

[anki-code]

I found that xc from xontrib-rc-awesome is very useful alias:

from shutil import which as _which

# Alias to get Xonsh Context.
# Read more: https://github.com/anki-code/xonsh-cheatsheet/blob/main/README.md#install-xonsh-with-package-and-environment-management-system
@aliases.register("xc")
def _alias_xc():
    """Get xonsh context."""    
    print('xpython:', imp.sys.executable, '#', $(@(imp.sys.executable) -V).strip())
    print('xpip:', $(which xpip).strip())  # xpip - xonsh's builtin to install packages in current session xonsh environment.
    print('')
    print('xonsh:', $(which xonsh))
    print('python:', $(which python), '#', $(python -V).strip())
    print('pip:', $(which pip))
    if _which('pytest'):
        print('pytest:', $(which pytest))
    print('')
    envs = ['CONDA_DEFAULT_ENV']
    for ev in envs:
        if (val := __xonsh__.env.get(ev)):
            print(f'{ev}:', val)

It will be grate to have xontext alias:

xontext
# [Current xonsh session]
# xpython: /Users/pc/.local/xonsh-env/bin/python # Python 3.12.2
# xpip: /Users/pc/.local/xonsh-env/bin/python -m pip
#
# [Current commands environment]
# xonsh: /Users/pc/.local/xonsh-env/xbin/xonsh  # https://github.com/anki-code/xonsh-install
# python: /opt/homebrew/bin/python # Python 3.11.6
# pip: /opt/homebrew/bin/pip

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