refactor: Move all xonsh session related global objects to xonsh session object

Long term meta issue.

Motivation

We need to have clear split two worlds:

1. xonsh session Python objects

• with private XonshSession (__xonsh__/xonsh.built_ins.XS)
• and with public XonshSessionHandler (@/XSH)

1. subprocess commands that manage the xonsh session.

XonshSessionHandler is a python object (public @/XSH). If we want to modify xonsh session we're using @. in xonsh mode and XSH. in Python mode. If we want to have CLI we can create built-in some alias and use it e.g. jobs, xontrib. So following this logic we need to move aliases, events objects into session.

Current inconsistency:

• jobs - command
• aliases - object
• @.env - object (sounds clear - "xonsh session env")
• events - object with list in __repr__
• xontrib - command

Implementation

• aliases to @.aliases/XSH.aliases (cc https://github.com/xonsh/xonsh/pull/5996)
• events to @.events/XSH.events (cc https://github.com/xonsh/xonsh/pull/6143)

Consequences

Before:

aliases['a'] = 'echo a'

@aliases.register
def _a():
    echo a

@events.on_chdir
def _source_env_xsh(olddir, newdir):
    pass

After:

@.aliases['a'] = 'echo a'
XSH.aliases['a'] = 'echo a'

@@.aliases.register
def _a():
    echo a

@XSH.aliases.register
def _a():
    echo a

@XSH.events.on_chdir
def _source_env_xsh(olddir, newdir):
    pass

For community

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