feat: Salish APA mapping

[joanise]

Pull request template for adding a new language

Do not use this for other types of pull requests

• Please check if the PR fulfills these requirements

• [x] Mapping files are added in g2p/mappings/langs

• [x] Mapping is either added to an existing folder or a new folder has been added

• [x] Language folder and files use appropriate ISO 639-3 codes

• [x] config-g2p.yaml file includes all author names, and settings necessary

• [x] Please add some test data in g2p/tests/public/data. The added file should be a csv/tsv/psv file and each row should have the format [input_mapping_code,output_mapping_code,input_string,output_string]

• [x] As the last step, G2P has been updated by running g2p update locally and committing the change

• [x] You agree to license your contribution under the same license as this project (see LICENSE file).

• Other information:

[github-actions[bot]]

CLI load time: 0:00.05
PR head a6aeb2f9f4505daa0ec1a331e99786a2d8fd1410
Imports that take more than 0.1 s:
import time: self [us] | cumulative | imported package

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.33%. Comparing base (2a18cdd) to head (a6aeb2f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #371 +/- ## ======================================= Coverage 93.33% 93.33% ======================================= Files 17 17 Lines 2431 2431 Branches 543 543 ======================================= Hits 2269 2269 Misses 92 92 Partials 70 70 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.