Add `PathfinderConfig` struct to control dispatch tree extraction,
and wire `use_dispatch_tree` through `DispatcherPattern`,
`init_with_config`,
and `analyze_and_build_type_mapping_for`. Expose config and wrapper
from `mingling_core` under the `pathf` feature.

Add `mingling_pathf` sub-crate and `pathf` feature for automatic
resolution of Mingling type module paths at build time. Scans source
files, identifies macro invocations via pattern matchers, and generates
mapping files consumed by `gen_program!()`.

Rename `test_pattern_analyzer` to clarify it runs once and update the
analyzer initialization to match the new API without adding a pattern
manually

Add a `PatternAnalyzer` with an `AnalyzePattern` trait to detect and
extract struct declarations from Rust source files, supporting nested
inline modules.