### Goals

* Make callable aliases transparent.
* Catch errors in callable aliases and show the name of the source.
* Show additional attributes: thredable, capturable.
* Closes #5266

## Exception

### Before

```xsh
aliases['cd']
# <function xonsh.dirstack.cd>

aliases['trace']
# <function xonsh.aliases.trace>

aliases['null'] = lambda: 1/0
null
# ZeroDivisionError: division by zero

@aliases.register('catch')
@aliases.register('me')
@aliases.register('if')
@aliases.register('you')
@aliases.register('can')
def _exc(args, stdin, stdout):
    for line in stdin.readlines():
        print(line.strip() + '!', file=stdout, flush=True)
    return 1/0 if 'i' in $__ALIAS_NAME else 0

echo hey | catch | me | if | you | can
# ZeroDivisionError: division by zero      <--- ???
# hey!!!!!
```

### After

```xsh 
aliases['cd']
# FuncAlias({'name': 'cd', 'func': 'cd'})

aliases['trace']
# FuncAlias({'name': 'trace', 'func': 'trace', '__xonsh_threadable__': False})

$XONSH_SHOW_TRACEBACK=False
$RAISE_SUBPROC_ERROR = False
aliases['null'] = lambda: 1/0
null
#Exception in thread {'cls': 'ProcProxyThread', 'name': 'Thread-15', 'func': FuncAlias({'name': 'null', 'func': '<lambda>'}), 'alias': 'null', 'pid': None}
#ZeroDivisionError: division by zero



@aliases.register('catch')
@aliases.register('me')
@aliases.register('if')
@aliases.register('you')
@aliases.register('can')
def _exc(args, stdin, stdout):
    for line in stdin.readlines():
        print(line.strip() + '!', file=stdout, flush=True)
    return 1/0 if 'i' in $__ALIAS_NAME else 0
echo hey | catch | me | if | you | can
# Exception in thread {'cls': 'ProcProxyThread', 'name': 'Thread-8', 'func': FuncAlias({'name': 'if', 'func': '_exc'}), 'alias': 'if', 'pid': None}
# ZeroDivisionError: division by zero
# hey!!!!!
```

## Superhelp

### Before
```xsh
@aliases.register("hello")
def _alias_hello():
    """Show world."""
    print('world')

hello?
# No manual entry for hello
```

### After
```xsh
@aliases.register("hello")
def _alias_hello():
    """Show world."""
    print('world')

hello?
# FuncAlias({'name': 'hello', 'func': '_alias_hello'}):
# Show world.
```



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comment**

---------

Co-authored-by: a <1@1.1>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>