Use dvc_... fields from https://github.com/iterative/dvc/pull/9019

[dberenbaum]

Fixes iterative/dvc#9018.

Depends on iterative/dvc#9019.

This incorporates the fields introduced by the linked DVC pull request into the vega-lite templates. Before this PR, the templates relied on a rev field that concatenated a bunch of internal DVC data (revision, filename, field name). This utilizes individual dvc_... fields to be able to use that data granularly in the templates.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (14f91b2) 96.55% compared to head (1cdf98f) 96.55%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #119   +/-   ##
=======================================
  Coverage   96.55%   96.55%           
=======================================
  Files          19       19           
  Lines         697      697           
  Branches      100      100           
=======================================
  Hits          673      673           
  Misses         20       20           
  Partials        4        4           

Impacted Files	Coverage Δ
src/dvc_render/vega_templates.py	98.27% <ø> (ø)
tests/test_vega.py	100.00% <100.00%> (ø)

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[dberenbaum]

Summary of changes in the PR:

• Set color by dvc_rev
• Set strokeDash by dvc_filename
• Set shape by dvc_field
• Use transparent fill to fix strokeDash legend formatting (otherwise shows all black filled circles)