Convert rmsbolt-line-mapping to a multi-file friendly format

The new format is (filename . number) -> <range> from number -> range.

Using this new format is not implemented yet
1 job for jay/multi-file in 37 seconds
latest
Status Job ID Name Coverage
  Test
failed #340419215
test

00:00:37

 
Name Stage Failure
failed
test Test
F...

Ran 11 tests in 0.112 seconds
4 unexpected results:
FAILED filter-tests-all-c
FAILED filter-tests-dir-c
FAILED filter-tests-none-c
FAILED filter-tests-weak-ref-c
ERROR: Job failed: exit code 1