Add an Ox/direct-style-compatible OpenTelemetry tracing backend

[adamw]

Currently sttp-client only ships with OT+ZIO tracing integration.

The goal of the issue is to create a new module, opentelemetry-tracing-sync-backend, which will provide integration with blocking/direct-style OpenTelemetry tracing, as well as reference documentation showcasing how to use the module.

Moreover, a first step is to suggest a way of propagating the context (setting appropriate headers, including identifiers/correlation ids) that is compatible with virtual threads & scoped values, as used by Loom and Ox. Note that the the OT Java libraries often rely on ThreadLocals, which are not Loom-compatible.

See also softwaremill/tapir#4103

[adamw]

/bounty $750

[algora-pbc]

💎 $750 bounty • SoftwareMill

Steps to solve:

1. Start working: Comment /attempt #2314 with your implementation plan
2. Submit work: Create a pull request including /claim #2314 in the PR body to claim the bounty
3. Receive payment: 100% of the bounty is received 2-5 days post-reward. Make sure you are eligible for payouts

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[varshith257]

Once #2314 is done I will jump here to tackle this.