feat: add property to cartesian widget to allow disabling band fetches

[jake-bassett]

Description

Add an additional model property to cartesian widget to allow band data fetching to be disabled.

[codecov]

Codecov Report

Merging #602 (a4afeee) into main (14a3264) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #602   +/-   ##
=======================================
  Coverage   85.08%   85.08%           
=======================================
  Files         768      768           
  Lines       15854    15856    +2     
  Branches     2035     2036    +1     
=======================================
+ Hits        13489    13491    +2     
  Misses       2332     2332           
  Partials       33       33           

Impacted Files	Coverage Δ
.../charts/cartesian-widget/cartesian-widget.model.ts	72.61% <100.00%> (+0.66%)	⬆️

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[github-actions]

Unit Test Results

    4 files  ±0  235 suites  ±0   14m 47s ⏱️ +48s
844 tests ±0  844 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
848 runs  ±0  848 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit cda2439. ± Comparison against base commit 14a3264.