feat(bootstrap): added aria tags for input validation (#3737)

[rpw1]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
This is a feature change to allow for screen reader to mention that an input is invalid and to read the validation error message that is paired with the form control.

What is the current behavior? (You can also link to an open issue here)
The current behavior is to not use aria-invalid or aria-descibedby. Here is the issue I created for this problem

What is the new behavior (if this is a feature change)?
The new change will only affect screen readers in bootstrap. It will now read that an input is invalid once shown error is called, and it will also read the error message that is paired with the form control.

Please check if the PR fulfills these requirements

• The commit messages follow our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• A unit test has been written for this change.
• Running npm run build produced a successful build. (Unit testing can be done by running npm test;)
• My code has been linted. (npm run lint to do this. npm run build will fail if there are files not linted.)

Please provide a screenshot of this feature before and after your code changes, if applicable.

Other information:

[rpw1]

I would very much appreciate helping me complete this pull request. This is helping to make Formly ADA compliant

[rpw1]

Hi it has been some time since I have submitted this pull request. Is there anything I can do to speed up the process? Is this change something that you would prefer not adding to your product?

Thanks

[aitboudad]

Hi, Thanks for the PR, I'll be able to check and merge the current work probably within max 2/3 weeks.
please note If you need that feature in your project I'd suggest to override form-field wrapper.

[rpw1]

@aitboudad Do you know when the work can be merged and the next release will occur? It is getting to the point to where I might need to start overriding the form-feild wrapper to achive this.

Thanks

[aitboudad]

@rpw1 still not be able to check it 🙏, at the moment I'd suggest overriding form-feild.

[aitboudad]

Thank you @rpw1!

[rpw1]

Thanks for taking the time to review and merge my changes. I very much appreciate it!