Handle encoding exceptions in OTLP exporters

[mohd-ibadullah]

Fixes #5050

• Catch encoding exceptions in OTLP gRPC exporters
• Catch encoding exceptions in OTLP HTTP exporters
• Log the error and return FAILURE instead of allowing unhandled exceptions
• Added regression tests for gRPC, traces, metrics, and logs exporters

[linux-foundation-easycla]

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• ✅ login: mohd-ibadullah / name: ibad (bbd31ff)

[hectorhdzg]

Need to add changelog fragment

[hectorhdzg]

There were some interest in some people to address this issue, no one was explicitly assigned I'm not seeing any other PR specific to this issue, @herin049 are you aware of any conflicting PR?

[herin049]

There were some interest in some people to address this issue, no one was explicitly assigned I'm not seeing any other PR specific to this issue, @herin049 are you aware of any conflicting PR?

@hectorhdzg There is some active work underway on refactoring some of the exporters, so I wanted to hold on addressing the issue. We should probably hold on this PR for now.