draft support for parsing slot results and appending text

[mchugh19]

What does this PR do?

Extends slot syntax to support parsing resulting dictionaries and appending text. Note: the appending process only functions on slot results which are strings.

Next steps:

• Since python structures are now injected with raw unicode: {u'shell': u'/bin/bash'} we could also force to json output if desired.

What issues does this PR fix or reference?

#50462
#46771

Previous Behavior

Using __slots__ with modules which return dictionaries required custom modules to parse result
Also, unable to append text

New Behavior

Support dictionary results by appending the slot function with period delimited dictionary keys to traverse
__slot__:salt:user.info(root).shell returns /bin/bash

Support appending data by using a tilde delimiter followed by text
__slot__:salt:user.info(root).shell ~ /appended~ returns /bin/bash/appended~

Tests written?

Yes

Commits signed with GPG?

No

[dwoz]

@mchugh19 Can you please add a test or two that cover this?

[mchugh19]

Tests have been added for the traverse and append functions.

In thinking about this a little bit more, the parsing for the append function looks for a tilde character and appends everything afterwards. It is possible that the slot text itself could contain that character as you might have cmd.run('ls ~user') or something. Should this behavior be updated to a more complicated regex, or maybe rather than just the single tilde character, the syntax could be forced to ~ with spaces on either side of the tilde? What do you all think it best?

[mchugh19]

Tests added

[mchugh19]

@DmitryKuzmenko you should take a look here as well