fix(490): Add question mark to escaped chars in TokenEscaper

[shchepinova]

This PR adds question mark ? to the escape characters in TokenEscaper.

The "Expand TokenEscaper to escape ? and | characters" issue also mentions adding the pipe character |, but this will cause TestMultiPrefixTextQuery.test_text_query_returns_both_prefixes, which uses the pipe character as a logical OR in its text search, to fail.

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Note

Low Risk
Low risk: small change to query-escaping behavior plus test updates; main impact is that literal ? will now be escaped unless wildcards are being preserved.

Overview
TokenEscaper now treats ? as a character that must be escaped in RediSearch query strings, and updates the referenced Redis docs link.

Unit tests are updated to assert ? is escaped in both general text and tag-like inputs, replacing prior TODO/expected-failure cases.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.