Add optional jinja2 dependency

[jsignell]

Related Issue(s):

• Closes Add jinja2 as an extra for accessing formatted html representation of Collections and Items #1082

Description:

#1142 still relies on jinja2 being installed, so it is totally independent of this PR

PR Checklist:

• pre-commit hooks pass locally
• Tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[jsignell]

not sure if this needs a changelog or not @gadomski

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5402e71) 90.94% compared to head (7fac3a5) 90.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1144   +/-   ##
=======================================
  Coverage   90.94%   90.94%           
=======================================
  Files          49       49           
  Lines        6645     6645           
  Branches      982      982           
=======================================
  Hits         6043     6043           
  Misses        422      422           
  Partials      180      180           

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