Enable GUI module resource file resolution

[NeonDaniel]

Refactors GUIInterface to send page_names containing GUI resource IDs
Adds unit tests for GUIInterface methods and updates docstrings
Refactors messagebus API to upload files as encoded binary for non-text resource support
Refactors GUIInterface to track page id's instead of file paths in the internal pages property

Description of new behavior:

• Previously, GUIInterface was responsible for resolving an absolute file path for a requested resource and sending lists of paths to the GUI module. This behavior remains for backwards-compat. but should be considered deprecated.
• GUIInterface now deals with page_name as an identifier, like other resources (i.e. gui_page -> gui_page.qt as stop -> stop.voc).
• .qml extensions are removed for backwards-compat with skills that request page names following the current syntax.
• ui_directories now supports a special case all key which should contain a directory with subdirectories for each supported gui framework (i.e. qt5, qt6).

  The recommended structure for skills is {root}/gui/qt5, {root}/gui/qt6, {root}/gui/common.

• gui.page.show and gui.page.delete messages now include page_names data which is a list of pages by ID, so the GUI module can handle requests per-client/framework. page keys remain for backwards-compat. but will be removed in the future since the paths contained there are framework-specific

[codecov]

Codecov Report

Merging #177 (62e4cca) into dev (ca88e1e) will increase coverage by 1.10%.
The diff coverage is 83.63%.

❗ Current head 62e4cca differs from pull request most recent head 78de0c0. Consider uploading reports for the commit 78de0c0 to get more accurate results

@@            Coverage Diff             @@
##              dev     #177      +/-   ##
==========================================
+ Coverage   26.56%   27.66%   +1.10%     
==========================================
  Files          49       49              
  Lines        6419     6456      +37     
==========================================
+ Hits         1705     1786      +81     
+ Misses       4714     4670      -44     

Impacted Files	Coverage Δ
ovos_utils/version.py	0.00% <0.00%> (ø)
ovos_utils/gui.py	46.97% <85.18%> (+9.16%)	⬆️

... and 2 files with indirect coverage changes