[Feature]: Add pad start formatting function

[drewcorlin1]

Requirement

As a followup to #2487, I would like to be able to pad trace IDs with leading 0s.

Problem

Given a traceparent header like 00-00000000000000001b3ef83a5d15ed1b-61409d351b3a5d99-01, jaeger will store (and thus display + interpolate) the trace ID as 1b3ef83a5d15ed1b. When attempting to use the shortened trace ID to link to logs some tracing integrations (in my case, logs using pino instrumented with the OpenTelemetry pino instrumentation) will use the full length trace ID, making jaeger link patterns not work.

Proposal

The syntax for this could look like #{traceID | pad_start 32 0}

Open questions

No response