EcsJsonConfiguration - With converters to protect against bad types

[snakefoot]

Trying resolve #219

[apmmachine]

:green_heart: Build Succeeded

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• Start Time: 2023-01-16T18:54:20.240+0000

• Duration: 18 min 49 sec

Test stats :test_tube:

Test	Results
Failed	0
Passed	186
Skipped	2
Total	188

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[Mpdreamz]

Jenkins run tests please

[snakefoot]

@Mpdreamz Merge conflicts now resolved

[Mpdreamz]

Thanks @snakefoot!

I ammended this PR to improve the overall safety MetadataDictionaryConverter. Ensuring an exception during the writing of a key's value does not fail to write the whole log.

Serialization failures are now stashed under metadata.__failures__.

Also made sure NLog tests flushes the logs to XUnit's Test Output so they can be easily inspected in test runners.

[Mpdreamz]

Jenkins run tests please