Add an 'extra' optional, `orjson` to experiment with rust speedups#64

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realtyem wants to merge 10 commits intomatrix-org:mainfrom

realtyem:jason/orjson

Commits on Aug 29, 2025

testing: the preserialization callback stuff is not used with orjson. Skip it
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testing: add a test for 'inf' variants and 'nan' nested inside the json being encoded
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setup: add the extra for 'orjson'
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chore: hookup orjson to provide the encoding
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testing: orjson's pretty print indentation is hard coded to a value of 2, so adjust a test
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fix: enforce that 'inf' variants and 'nan' are not allowed when using orjson
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testing: adjust the mypy test run to include the typing for orjson
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testing: try and work up a matrix to test both with and without the new orjson extra option
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fix: remove python version 3.7 support(and add in newer versions)
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fix: use _preprocess_for_serialisation() for orjson too, this solves immutabledict and add this as a test
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