feat: add separateReadonlyFromDisabled config option

[kchobantonov]

Allows independent control of readonly and enabled states. Adds READONLY/WRITABLE rule effects. Backward compatible (default: false).

fixes #2479

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[kchobantonov]

@sdirix @lucas-koehler please review - this provides the core and vue-vuetify implementation - the other renderers can be done separately

[coveralls]

coverage: 82.852% (+0.1%) from 82.744%
when pulling 9c5c54d on kchobantonov:separate-readonly-from-disabled
into 754d9dd on eclipsesource:master.

[lucas-koehler]

Hi @kchobantonov , thanks for this contribution ❤️
The changes already look pretty good to me.

I have two points:

1. The calculation !control.enabled || control.readonly is used in many renderers now. Could it make sense to extract a utility for this?
2. We should add unit tests for the following:
   1. evalReadonly() function
   2. hasReadonlyRule() function
   3. isReadonly() function
   4. isInherentlyReadonly() function
   5. The new separateReadonlyFromDisabled config option behavior in isInherentlyEnabled()
   6. The new READONLY and WRITABLE rule effects

[kchobantonov]

@lucas-koehler please review

[sdirix]

Thanks for the rework. Two minor comments.

[kchobantonov]

@sdirix @lucas-koehler please review again - thanks

[lucas-koehler]

@kchobantonov LGTM now 🚀 Thanks for the contribution and all the updates ❤️

The two comments have been fixed in the latest commit :)

[lucas-koehler]

@sdirix I added this to the milestone despite having an issue because the issue does not consider the vuetify implementation