contrib/sirupsen/logrus: support 128-bit Trace IDs and make IDs strings

[diegommm]

What does this PR do?

• The logrus hook was always using 64-bit Trace IDs, which broke correlation since the default now is using 128-bit.
• When using JSON output some systems may treat JSON numbers specially and remove precision. Formatting them as string from the get-go will preserve them.

Fixes #3324

Motivation

Enabling correlation of logs and traces as presented in https://docs.datadoghq.com/tracing/other_telemetry/connect_logs_and_traces/go/

Reviewer's Checklist

• [ ] Changed code has unit tests for its functionality at or near 100% coverage.
• [ ] Add an appropriate team label so this PR gets put in the right place for the release notes.