docs: expand Turbopack customizable operators with individual examples
Add dedicated examples for each customizable condition operator (path,
content, query, contentType) and a combining operators section.
Previously, the operators were only described in brief bullet points
with a single complex combined example. Now each operator has its own
subsection with practical, standalone code examples showing both string
and RegExp usage where applicable.
The query operator examples are drawn from PR #88644 which added
condition.query support. Also includes a note linking to webpack's
resourceQuery for users migrating from webpack.
Closes #90560
Co-authored-by: Joseph <icyJoseph@users.noreply.github.com>