fix: ensure cosmian_logger build on wasm - even not used on wasm

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[Copilot]

Pull request overview

This PR updates cosmian_logger to compile for wasm32-unknown-unknown even when the crate isn’t used on wasm targets, and adds CI/pre-commit coverage for that build.

Changes:

• Added wasm32-specific cfg gating to avoid pulling in OTLP / SDK / syslog / file-rotation code on wasm.
• Improved __fn_name! macro stripping for async/closure contexts and added an async test.
• Added a custom tracing-subscriber field formatter (named fields before message) and introduced a dedicated wasm build job + pre-commit hook.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
crate/logger/src/types.rs	Adds wasm gating for OTLP SDK types and guards; adjusts config fields for wasm.
crate/logger/src/lib.rs	Splits subscriber init into wasm vs non-wasm paths; adds FieldsBeforeMessage formatter; gates OTLP helpers for wasm.
crate/logger/src/macros.rs	Enhances __fn_name! to strip async/closure anonymous segments.
crate/logger/src/tests.rs	Adds an async test for __fn_name! behavior in async fns.
crate/logger/src/error.rs	Gates OTLP exporter error variants on non-wasm.
crate/logger/Cargo.toml	Moves tokio/tonic/syscall-dependent deps behind non-wasm target deps.
.pre-commit-config.yaml	Adds a wasm build hook for cosmian_logger.
.github/workflows/ci.yml	Adds a wasm-build job to build cosmian_logger for wasm32-unknown-unknown.

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