SearchIndex: more Term tests

fix type hint for exception (implicit null issue)

SearchIndex: TupleOps now work with frequencies of 1

We have indexes where we simply track that a relation between entity and
token exists, but there is no frequency. The frequency is always 1.
For

SearchIndex: TupleOps now work with frequencies of 1

We have indexes where we simply track that a relation between entity and
token exists, but there is no frequency. The frequency is always 1.
For those indexes we do not store *1 as frequency but omit it
completely.

The TupleOps class now can work with such indexes and will also store
frequencies of 1 like this.

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�� Rector and PHPCS fixes

replace E_USER_ERROR triggers with RuntimeExceptions

The use of trigger_error with a E_USER_ERROR is deprecated in PHP 8.4

Use str_starts_with/str_ends_with

code style: operator spacing

coding style: control flow line breaks

coding style: control flow whitespaces

recover comments in list

coding style: function call spacing

coding style: loop declaration spacing

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: class declaration braces

codestyle adjustments: function argument spacing

Apply rector fixes to the rest of inc