POC: Custom EDS fieldTypes

[TalmizAhmed]

Description

When not providing a fieldType in crx, the fieldType is inferred from the sling model [0].
This PR allows for the fieldType to be overridden in crx with a custom value, such that it should show up in the JSON.

[0] #1409

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[adobe-bot]

Accessibility Violations Found

Id	Impact
focus-order-semantics	minor
label-title-only	serious
landmark-one-main	moderate
region	moderate
target-size	serious

[adobe-bot]

Lighthouse scores (desktop)

	Performance	Accessibility	Best-Practices	SEO
Scores	100	96	96	75

[adobe-bot]

Lighthouse scores (mobile)

	Performance	Accessibility	Best-Practices	SEO
Scores	95	96	96	75

[adobe-bot]

Accessibility Violations Found

Id	Impact
label-title-only	serious
target-size	serious

[adobe-bot]

Accessibility Violations Found

Id	Impact
label-title-only	serious
target-size	serious

[adobe-bot]

Accessibility Violations Found

Id	Impact
label-title-only	serious
target-size	serious

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.43%. Comparing base (77886e9) to head (6204010).

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #1417      +/-   ##
============================================
+ Coverage     82.40%   82.43%   +0.02%     
- Complexity      919      920       +1     
============================================
  Files           103      103              
  Lines          2358     2362       +4     
  Branches        317      317              
============================================
+ Hits           1943     1947       +4     
  Misses          255      255              
  Partials        160      160              

Flag	Coverage Δ
	82.43% <100.00%> (+0.02%)	⬆️

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[TalmizAhmed]

Closing as spec does not want to allow this.