!!![FEATURE] Allow using complex filter values in FlexForm

[echavaillaz]

With this PR it is now possible to use complex query in FlexForm filter value.

I add a regex to prevent a too big breaking change. The old behaviour is still working, so if a string value contains space(s) and no special characters of the solr query parser, the string is always wrapped with double quotes. But if the string contains special characters no wrapping happen (special characters are + - && || ! ( ) { } [ ] ^ " ~ * ? : \.

There is some cases where this PR can break, for example if the filter value is something like toto AND tata or music (rock) or my "flow" is. Here the wrapping and the escaping of the inner double quote have to be manually updated like this "toto AND tata", "music (rock)" and "my \"flow\" is".

Fixes: #2151

[dkd-kaehm]

The code base LGTM!
Please add

• the hints from your issue comment FlexForm filter values are force quoted #2151 (comment)
  to the docs, so users are aware of.
• and a little sentence in Documentation/Releases/solr-release-12-0.rst about this feature.

[dkd-kaehm]

@echavaillaz
Please fix the issues from GH-actions:
https://github.com/TYPO3-Solr/ext-solr/actions/runs/5334225100/jobs/9668256731?pr=3703

For CS fixes just run this command:
TYPO3_VERSION=12.4.x-dev composer tests:setup && composer t3:standards:fix

The unit test and/or method ConfigurationService::getFilterFromFlexForm() must be adjusted:

1) ApacheSolrForTypo3\Solr\Tests\Unit\System\Service\ConfigurationServiceTest::canOverrideConfigurationWithFlexFormSettings with data set "simpleInteger" ('id', 4711, 'id:4711')
TypeError: ApacheSolrForTypo3\Solr\Tests\Unit\System\Service\ConfigurationServiceTest::canOverrideConfigurationWithFlexFormSettings(): Argument #2 ($filterValue) must be of type string, int given, called in /home/runner/work/ext-solr/ext-solr/.Build/vendor/phpunit/phpunit/src/Framework/TestCase.php on line 1608

/home/runner/work/ext-solr/ext-solr/Tests/Unit/System/Service/ConfigurationServiceTest.php:107
/home/runner/work/ext-solr/ext-solr/.Build/bin/phpunit:123

--

There was 1 failure:

1) ApacheSolrForTypo3\Solr\Tests\Unit\System\Service\ConfigurationServiceTest::canOverrideConfigurationWithFlexFormSettings with data set "escapedString" ('id', 'foo"bar', 'id:"foo\"bar"')
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
-    0 => 'id:"foo\"bar"'
+    0 => 'id:foo"bar'
 )

[echavaillaz]

Ready to test?