feat(Cosmos): TrustLocalEmulator=true

[bartelink]

Provides a lean and safe one-stop-shop way to use a local Cosmos emulator by setting EQUINOX_COSMOS_CONNECTION to TrustLocalEmulator=true instead of one or more of:

1. having risky and/or messy conditional logic in your system that can ignore SSL cert checking
2. having to copy around magic values for the Emulator's URI or AccessKey
3. having to (on a Mac) register the Emulator's self-signed certificate in the Key Chain in order to trust it

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Sadly this doesn't yet work on Mac so is useless as it stands, as docker-compose-cosmos.sh hangs when creating the database:

1. could be due to ports used in Direct mode in Docker not being exposed correctly
2. could be due to some other aspect of the system needing the Emulator Cert to be registered in the KeyChain

(the MS examples for skipping TLS all show Gateway mode)

[bartelink]

Superseded by Azure/azure-cosmos-dotnet-v3#4222
#443

Will circle back and see if it actually becomes possible to stop trusting the cert entirely
The fact this PR did not work suggests there's still something missing from the equation when using Direct mode against a dockerized emulator