Fix feature flags

[ChieloNewctle]

Fixes

Fix feature flags of opentelemetry-otlp and opentelemetry-proto.

$ cargo check -p opentelemetry-otlp -F http-proto
    Checking opentelemetry-otlp v0.15.0 (/home/SENSETIME/jiangshenghu1/opentelemetry-rust/opentelemetry-otlp)
error[E0432]: unresolved import `crate::exporter::OTEL_EXPORTER_OTLP_PROTOCOL_DEFAULT`
   --> opentelemetry-otlp/src/lib.rs:247:5
    |
247 |     OTEL_EXPORTER_OTLP_PROTOCOL_DEFAULT, OTEL_EXPORTER_OTLP_TIMEOUT,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |     |
    |     no `OTEL_EXPORTER_OTLP_PROTOCOL_DEFAULT` in `exporter`
    |     help: a similar name exists in the module: `OTEL_EXPORTER_OTLP_ENDPOINT_DEFAULT`
    |
...

$ cargo check -p opentelemetry-otlp --no-default-features -F http-json,logs
    Checking opentelemetry-otlp v0.15.0 (/home/SENSETIME/jiangshenghu1/opentelemetry-rust/opentelemetry-otlp)
error[E0277]: the trait bound `ResourceLogs: From<(LogData, &ResourceAttributesWithSchema)>` is not satisfied
   --> opentelemetry-otlp/src/exporter/http/mod.rs:335:52
    |
335 |             .map(|log_event| (log_event, resource).into())
    |                                                    ^^^^ the trait `From<(LogData, &ResourceAttributesWithSchema)>` is not implemented for `ResourceLogs`, which is required by `(LogData, &ResourceAttributesWithSchema): Into<_>`
    |
    = note: required for `(LogData, &ResourceAttributesWithSchema)` to implement `Into<ResourceLogs>`

For more information about this error, try `rustc --explain E0277`.
error: could not compile `opentelemetry-otlp` (lib) due to 1 previous error

Changes

• Update compilation conditions of OTEL_EXPORTER_OTLP_PROTOCOL_DEFAULT in opentelemetry-otlp/src/exporter/mod.rs to fix cargo check -p opentelemetry-otlp -F http-proto.
• Change the feature flag condition of opentelemetry-proto/src/transform/logs.rs from gen-tonic to gen-tonic-messages to fix cargo check -p opentelemetry-otlp --no-default-features -F http-json,logs.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
  • Related to building. cargo-all-features can be added to CI to check with different combinations of feature flags.
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)
  • No change in public API.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ChieloNewctle / name: Chielo (e058adf, d1c0d5d)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.4%. Comparing base (348ec9e) to head (d1c0d5d).
Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1746     +/-   ##
=======================================
+ Coverage   71.0%   71.4%   +0.3%     
=======================================
  Files        135     136      +1     
  Lines      20751   20880    +129     
=======================================
+ Hits       14746   14915    +169     
+ Misses      6005    5965     -40     

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