Decompose patterned text message into doc values

[parkertimmins]

Minimal version of patterned text mapping. Using simple parsing to decompose log message into template, timestamp, and arguments doc values. Use a single inverted index built from the original message. Likely only support boolean term queries, similar to match_only_text. Potentially extend to inefficient phrase queries using the reconstructed message.

This will largely follow the work in the previous pattern text prototype: #124323

Behavior

• input text will be split on a hard-coded list of delimiters
• tokens which contain a digit will be arguments, otherwise will be part of template
• template tokens will be joined with a placeholder which stands in for the extracted args
• template with placeholder will be stored in a SortedDocValue
• args will be stored in a single SortedSetDocValue
• Docs are sorted by template, then by arguments
• Original message text is indexed, likely without positions.

Features in prototype which will be missing from MVP:

• IP/UUID parsing
• separate timestamp handling
• optimized arguments
• template access through separate field

[elasticsearchmachine]

Pinging @elastic/es-storage-engine (Team:StorageEngine)

[parkertimmins]

Fixed in #129292