Use JSON source generator & enable trimming in DistributedCacheMetadataService

[eduar-hte]

This is an update to be able to use DistributedCacheMetadataService in an AOT build, based on work in PR #304.

In order to store and retrieve the cached metadata blob, calls to JsonSerializer's Serialize & Deserialize need to specify FidoModelSerializerContext.Default.MetadataBLOBPayload.

[eduar-hte]

@dotnet-policy-service agree

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.04%. Comparing base (b6102f0) to head (e878077).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #589   +/-   ##
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  Coverage   76.04%   76.04%           
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  Files         101      101           
  Lines        2601     2601           
  Branches      432      432           
=======================================
  Hits         1978     1978           
  Misses        513      513           
  Partials      110      110           

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