Adds ntd modes seed file and easy conversions from two letter ntd modes

[vevetron]

Description

Adds ntd modes seed file and easy conversions from two letter ntd modes to the full name.

Makes it easier to make dashboards.

Chose not to extend dim_modes since that describes more California modes, not national modes.

Uses descriptions from https://github.com/cal-itp/data-infra/pull/3378

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation

How has this been tested?

poetry run dbt seed
poetry run dbt run -s +dim_monthly_ntd_ridership_with_adjustments --full-refresh
poetry run dbt run -s +dim_annual_ntd_agency_service --full-refresh

Post-merge follow-ups

• [x] No action required
• [ ] Actions required (specified below)

[github-actions[bot]]

Warehouse report 📦

Checks/potential follow-ups

Checks indicate the following action items may be necessary.

• [ ] For new models, do they all have a surrogate primary key that is tested to be not-null and unique?

New models 🌱

calitp_warehouse.intermediate.ntd.intntd\_modes

DAG

Legend (in order of precedence)

Resource type	Indicator	Resolution
Large table-materialized model	Orange	Make the model incremental
Large model without partitioning or clustering	Orange	Add partitioning and/or clustering
View with more than one child	Yellow	Materialize as a table or incremental
Incremental	Light green
Table	Green
View	White