[api] split up do_mappings() into something more fine-grained

Interactive use, like in lnav, will require fine-grained
control of the operations done in `do_mappings()`.  This
change adds a LogMatcher with associated functions that
perform the different steps that were in `do_mappings()`.

Author: tstack

Cargo.lock

@@ -11,11 +11,13 @@ indicatif = "0.18.0"
 regex = "1.11.1"
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.140"
+thiserror = "2.0.16"
 tree-sitter = "0.25.3"
 tree-sitter-cpp = "0.23.4"
 tree-sitter-rust-orchard = "0.12.0"
 tree-sitter-java = "0.23.5"
 rayon = "1.11.0"
+miette = { version = "7.6.0", features = ["fancy"] }
 
 [build-dependencies]
 cc="*"