export metadata as json

[flaport]

using write_gds(with_metadata=True) and import_gds(read_metadata=True) is very slow for large PICs. I've added additional flags write_gds(with_metadata_json=...) and import_gds(read_metadata_json=...) that exports the metadata to json and writes/reads the json with orjson. This is orders of magnitude faster than the yaml write/read.

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (faf6f4e) 72.55% compared to head (134384a) 72.48%.

Files	Patch %	Lines
gdsfactory/read/import_gds.py	10.52%	16 Missing and 1 partial ⚠️
gdsfactory/component.py	20.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2487      +/-   ##
==========================================
- Coverage   72.55%   72.48%   -0.07%     
==========================================
  Files         366      366              
  Lines       23389    23413      +24     
  Branches     3810     3821      +11     
==========================================
+ Hits        16969    16972       +3     
- Misses       5292     5311      +19     
- Partials     1128     1130       +2     

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