[New Feature]: Implement module-ballerinax-newrelic extension

[NipunaMadhushan]

Description

Currently we doesn't have an extension to directly publish observability data to New Relic. We use our existing extensions ballerinax/prometheus and ballerinax/zipkin to publish observability data to New Relic.

1. ballerinax/prometheus - Use remote_write_url method to publish metrics to New Relic.
2. ballerinax/zipkin - Use reporterEndpointURL configuration to set New Relic Trace API

In publishing traces, the Zipkin uses HTTP protocol which is much slower than GRPC protocol. We also converts OpenTelemetry trace data into Zipkin format which is unnecessary since New Relic supports OpenTelemetry format.
In publishing metrics, We use prometheus as an intermediate server which is completely unnecessary while we can publish data directly via their Metric API.

Therefore we need a separate extension for New Relic which publishes both metrics and traces to New Relic.

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Related area

-> Compilation

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