refactor: rename plugin features with type prefix for consistency

- Plugin features now use type_ prefix (meta_magic, filter_grep, etc.)
- Added meta_all_musl and filter_all_musl for MUSL-compatible builds
- grep filter plugin made optional via filter_grep feature flag
- Removed regex crate from grep-related code, uses strip_prefix instead
- Updated CHANGELOG.md with breaking change documentation

src/meta_plugin/mod.rs

@@ -8,7 +8,7 @@ pub mod digest;
 pub mod env;
 pub mod exec;
 pub mod hostname;
-#[cfg(feature = "infer")]
+#[cfg(feature = "meta_infer")]
 pub mod infer_plugin;
 pub mod keep_pid;
 pub mod magic_file;
@@ -17,32 +17,32 @@ pub mod read_time;
 pub mod shell;
 pub mod shell_pid;
 pub mod text;
-#[cfg(feature = "tokens")]
+#[cfg(feature = "meta_tokens")]
 pub mod tokens;
-#[cfg(feature = "tree_magic_mini")]
+#[cfg(feature = "meta_tree_magic_mini")]
 pub mod tree_magic_mini;
 pub mod user;
 
 pub use digest::DigestMetaPlugin;
 pub use exec::MetaPluginExec;
-#[cfg(feature = "magic")]
+#[cfg(feature = "meta_magic")]
 pub use magic_file::MagicFileMetaPlugin;
 // pub use text::TextMetaPlugin; // Removed duplicate
 pub use cwd::CwdMetaPlugin;
 pub use env::EnvMetaPlugin;
 pub use hostname::HostnameMetaPlugin;
-#[cfg(feature = "infer")]
+#[cfg(feature = "meta_infer")]
 pub use infer_plugin::InferMetaPlugin;
 pub use keep_pid::KeepPidMetaPlugin;
 pub use read_rate::ReadRateMetaPlugin;
 pub use read_time::ReadTimeMetaPlugin;
 pub use shell::ShellMetaPlugin;
 pub use shell_pid::ShellPidMetaPlugin;
-#[cfg(feature = "tree_magic_mini")]
+#[cfg(feature = "meta_tree_magic_mini")]
 pub use tree_magic_mini::TreeMagicMiniMetaPlugin;
 pub use user::UserMetaPlugin;
 
-#[cfg(not(feature = "magic"))]
+#[cfg(not(feature = "meta_magic"))]
 pub use magic_file::FallbackMagicFileMetaPlugin as MagicFileMetaPlugin;
 
 type PluginConstructor = fn(