Release v0.51.0

Added

• Keep track of and report rule parse time in addition to file parse time
• v0 of opt-in anonymous aggregate metrics

Fixed

• JS/TS: allow the deep expression operator <... ...> in expression
  statement position, for example:

$ARG = [$V];
...
<... $O[$ARG] ...>; // this works now

• PHP arrays with dots inside parse
• Propagate constants in nested lvalues such as y in x[y]
• C# experimental support

Changed

• Show log messages from semgrep-core when running semgrep with
  --debug.
• By default, targets larger than 1 MB are now excluded from semgrep
  scans. New option --max-target-bytes 0 restores the old behavior.
• Report relative path instead of absolute when using --time