feat: add maubot rock

[amandahla]

Applicable spec:

Overview

Maubot is a python application. This PR creates a rock for it.

Reference:
https://docs.mau.fi/maubot/usage/setup/index.html

Rationale

Create a rock to be published as a charm resource.

Juju Events Changes

Module Changes

Library Changes

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated
• The PR is tagged with appropriate label (urgent, trivial, complex)

No CH available yet.

[github-actions]

Test coverage for 7d7088d

Name           Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------
src/charm.py      30      8      4      1    68%   39, 46-52
----------------------------------------------------------
TOTAL             30      8      4      1    68%

Static code analysis report

Run started:2024-09-09 19:57:47.932161

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 118
  Total lines skipped (#nosec): 0
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):