feat: Enable users to configure sampling of traces

[pranay01]

Is your feature request related to a problem?

Sending events data without sampling makes the ingestion rate very high which leads to higher resource requirements. Some users may be comfortable with capturing only sampled data if they don't need high granularity in traces data.

Describe the solution you'd like

OpenTelemetry collector provides sampling processors like Probabilistic Sampling and Tail Based sampling

users should be able to enable these easily using SigNoz dashboard and set sampling granularity

Describe alternatives you've considered

None. Sampling seems to be a feature which should be enabled.

Additional context

Add any other context or screenshots about the feature request here.

Thank you for your feature request – we love each and every one!

[pranay01]

Some relevant discussions:
open-telemetry/opentelemetry-collector-contrib#4462

[makeavish]

Sampling is already possible at the user's collector. Until SigNoz has UI support, users can continue configuring sampling at collector/agent level by following below docs:

1. Traces
2. Logs
3. Metrics