Convert projectmirador/mirador to a monorepo

[cbeer]

A monorepo (pulling in mirador, mirador-annotations, -image-tools, etc) may make it easier to develop and maintain core plugins. It may also make it easier to manage some of the core mirador components if we extract additional packages for e.g. the window, workspace, etc pieces with clearly defined boundaries between the different pieces.

TODOs:

• convert webpack to vite (proposed).
• convert jest to vitest (jest doesn't seem to play too nice with the monorepo setup)
• ??

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.52%. Comparing base (05194d8) to head (6d507bd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3984   +/-   ##
=======================================
  Coverage   94.52%   94.52%           
=======================================
  Files         313      313           
  Lines       14767    14767           
  Branches     2496     2496           
=======================================
  Hits        13958    13958           
  Misses        804      804           
  Partials        5        5           

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