enhancement: Add different samplers and propagators support with OpenTelemetry (#2201)

* Samplers: Check PR/helm values for supported types
* Propagators: Check PR/helm values for supported types
* Added tracing support via fission CLI
* Use parentbased_traceidratio as default sampler with 0.1 ratio

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

charts/fission-core/templates/_helpers.tpl

@@ -52,6 +52,12 @@ This template generates the image name for the deployment depending on the value
 - name: OTEL_EXPORTER_OTLP_HEADERS
   value: "{{ .Values.openTelemetry.otlpHeaders }}"
 {{- end }}
+- name: OTEL_TRACES_SAMPLER
+  value: "{{ .Values.openTelemetry.tracesSampler }}"
+- name: OTEL_TRACES_SAMPLER_ARG
+  value: "{{ .Values.openTelemetry.tracesSamplingRate }}"
+- name: OTEL_PROPAGATORS
+  value: "{{ .Values.openTelemetry.propagators }}"
 {{- end }}
 
 {{- define "opentracing.envs" }}