Log Message:
Import highway-1.1.0 as textproc/highway.

Provided by NONAKA Kimihiro in PR 50504.

Highway
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A fast pattern matching tool like pt and ag.

Feature:
- It can search the PATTERN from your source code very fast.
- It can search also the PATTERN as a regular expression.
- It supports UTF-8 and some Japanese encodings (Because I'm
  Japanese. EUC-JP and Shift_JIS is supported).
- It ignores file patterns form your .gitignore by default.