Feature: #108557 - TCA option allowedRecordTypes for Page Types 

See forge#108557

Description 

A new TCA option allowedRecordTypes is introduced for Page Types to configure allowed database tables for specific types ("doktype").

EXT:my_extension/Configuration/TCA/Overrides/pages.php 
// Allow any record on that Page Type.
$GLOBALS['TCA']['pages']['types']['116']['allowedRecordTypes'] = ['*'];

// Only allow specific tables on that Page Type.
$GLOBALS['TCA']['pages']['types']['116']['allowedRecordTypes'] = ['tt_content', 'my_custom_record'];
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The array can contain a list of table names or a single entry with an asterisk * to allow all types.

Per default only the tables pages, sys_category, sys_file_reference and sys_file_collection are allowed, if not overridden with this option.

The defaults are extended, if TCA tables enable the option ctrl.security.ignorePageTypeRestriction. Again, this won't be considered if allowedRecordTypes is set. They need to be configured there as well.

Impact 

The allowed record types for pages can now be configured in TCA. This centralizes the configuration for Page Types and further slims down the need for ext_tables.php, which was utilized before.