refactor: factor out env-filter as logforth-filter-rustlog

[tisonkun]

This closes #230

[Copilot]

Pull request overview

This PR addresses #230 by extracting the env_filter implementation out of logforth-core into a dedicated filter crate (logforth-filter-rustlog), updating Logforth’s public surface and examples to use the new filter crate and naming.

Changes:

• Introduces the new logforth-filter-rustlog crate and wires it into the workspace and logforth feature set (filter-rustlog).
• Removes env_filter from logforth-core and updates starters/examples to use RustLogFilter/RustLogFilterBuilder.
• Renames the log bridge type from LogAdapter to LogBridge and updates call sites.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
Cargo.toml	Adds filters/* to workspace members and registers logforth-filter-rustlog as a workspace dependency.
CHANGELOG.md	Documents the env-filter extraction/rename under breaking changes.
core/src/filter/mod.rs	Removes env_filter module and EnvFilter re-export from logforth-core.
core/Cargo.toml	Removes now-unused dev dependency entries related to the moved filter tests.
filters/rustlog/Cargo.toml	Adds new crate manifest for logforth-filter-rustlog.
filters/rustlog/README.md	Updates crate README header for the extracted filter crate.
filters/rustlog/src/lib.rs	Implements/renames filter API to RustLogFilter + builder and switches to logforth-core types.
filters/rustlog/src/tests.rs	Updates tests to the extracted crate and renamed types.
logforth/Cargo.toml	Adds filter-rustlog feature and includes it in starter-log.
logforth/src/lib.rs	Re-exports the new filter crate behind the filter-rustlog feature.
logforth/src/starter_log.rs	Updates starter defaults to use RustLogFilterBuilder and renames LogAdapter usage to LogBridge.
bridges/log/src/lib.rs	Renames the public bridge type to LogBridge.
examples/Cargo.toml	Adds a passthrough feature for filter-rustlog.
examples/src/asynchronous.rs	Updates example to use LogBridge.
examples/src/log_with_logger.rs	Updates example to use LogBridge.
examples/src/per_module_log_levels.rs	Updates example to use RustLogFilterBuilder.
examples/src/per_module_with_ctor.rs	Updates example helper to build a RustLogFilter via RustLogFilterBuilder.

Comments suppressed due to low confidence (3)

filters/rustlog/src/lib.rs:43

• Minor grammar in crate-level docs: "most common used" should be "most commonly used".
  filters/rustlog/src/lib.rs:159
• Grammatically, this should be "a [RustLogFilter]" (not "an").
  filters/rustlog/src/lib.rs:318
• Grammatically, this should be "a [RustLogFilter]" (not "an").

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[ariesdevil]

Great!