Fluent Bit Lambda Extensions Example added

[youngjeong46]

Issue #, if available:

Description of changes:

Added extensions example for Fluent-Bit. Requesting Code Review.

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[r0mdau]

Thanks for this example.

Have you planned (or discussed with fluentbit maintainers) to develop directly a input plugin in fluentbit that implement the lambda logs API ?

[PettitWesley]

NOTE: For folks who find this and wonder why we abandoned it, it was because the extension tended to lose logs when the lambda function was invoked repeatedly with a very short runtime. It is possible that this solution can work well if you know that your function will always execute for at least 1 second.

@r0mdau We discussed building native support in FB but that would require a lot more work. It's very non-trivial.

[julianwood]

Closing based on submitter comments.