[clang-format] Ignore imports in comments for Java import sorting (#177326)
Java source files can contain apparent import statements inside block
comments (e.g., showing a code example). These can get mixed up with
real import statements when run through clang-format.
This patch tracks block comments (/* ... */) so that we skip lines that
are inside them.
Fixes #176771
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Co-authored-by: Natalia Kokoromyti <knatalia@yost-cm-01-imme.stanford.edu>
Co-authored-by: owenca <owenpiano@gmail.com>