in_opentelemetry: use ctraces to decode binary payload

[Syn3rman]

• Use ctraces to decode binary payload
• add config option for raw_traces that decides whether to process or forward traces

Signed-off-by: Aditya Prajapati aditya@calyptia.com

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Enter [N/A] in the box, if an item is not applicable to your change.

Testing
Before we can approve your change; please submit the following in a comment:

• Example configuration file for the change

[INPUT]
	name opentelemetry
	host 127.0.0.1
	port 4318
	raw_traces true

[OUTPUT]
	name stdout
	match *

• Debug log output from testing the change
  

• Attached Valgrind output that shows no leaks or memory corruption was found
  https://pastebin.com/cyfC0DNS

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• Attached local packaging test output showing all targets (including any new ones) build.

Documentation

• Documentation required for this feature

fluent/fluent-bit-docs#872

Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

[edsiper]

isn't this leading to a memory leak ? decode_context is not been destroyed

[edsiper]

make sure to include a valgrind output with --leak-check=full

[Syn3rman]

@edsiper fixed and attached valgrind output