build(deps): update Rust dependencies (2022-W39)

Some notable changes:

- Upgrade to latest tracing/openteletetry dependencies:
  - opentelemetry 0.18.0
  - opentelemetry-otlp 0.11.0
  - opentelemetry-semantic-conventions 0.10.0
  - tracing-opentelemetry 0.18.0
- Due to updates in opentelemetry-api dropping some Display trait
  implementations some changes had to be made to preserve the string
  representations (in one case static strings is used, and in another
  case a wrapping unit type is used to ship a similar Display impl)

References: open-telemetry/opentelemetry-rust#758
References: tokio-rs/tracing#1218

Signed-off-by: Fletcher Nichol <[email protected]>

Author: fnichol