Search Api compatibility

Problem/Motivation

Add support for `search_api` module

Steps to reproduce

Use `search_api` + `views` with `Content datasource` fields

It won't show up with indexed fields.

Proposed resolution

Add support for it to check if this module is enabled and overriding of existing `Drupal\search_api\Plugin\views\filter\SearchApiTerm` term handle.

As a temporary solution, I added a patch for `search_api` module with the same changes that are in this module to `Drupal\search_api\Plugin\views\filter\SearchApiTerm` class from `Drupal\views_taxonomy_radios_filter\Plugin\views\filter\TaxonomyIndexTid` class

attaching patch for `search_api` module version 8.x-1.30