Add base sql to schema repo

[jenningsanderson]

Description

Adds the SQL files that contain the logic to map features between OSM tags and Overture values. These are added to the task-force-docs.

Currently, the logic behind the base theme is a series of SQL files here that are assembled by a (perhaps hacky) render script and then included in the Airflow DAG to create the base data from the daylight map distribution. Limitations include:

1. Must run render_queries.py script before committing / pushing code.
2. Logic is hidden in private data-platform repo.

This PR moves these SQL files to the public schema repo. Advantages include:

1. The logic is publicly available and can be version-controlled by release.
2. Matches other themes (such as buildings) by publishing the OSM tag mappings in schema/task-force-docs

The biggest advantage here is that the actual SQL logic that creates a given release can be tied to a schema release version.

On the data-platform side, https://github.com/OvertureMaps/tf-data-platform/pull/158 alters the Airflow DAG to pull these SQL files from the schema repo before each run.

Reference

List of relevant links to GitHub issues, PRs, and other documentation.

1. https://github.com/OvertureMaps/tf-data-platform/pull/158

Testing

Brief description of the testing done for this change showing why you are confident it works as expected and does not introduce regressions. Provide sample output data where appropriate.

The Airflow DAG for base_theme_staging reads the files from this PR.

Checklist

Checklist of tasks commonly-associated with schema pull requests. Please review the relevant checklists and ensure you do all the tasks that are required for the change you made.

1. [N/A] Add relevant examples.
2. [N/A] Add relevant counterexamples.
3. [N/A] Update in-schema documentation using plain English written in complete sentences, if an update is required.
4. [N/A] Update Docusaurus documentation, if an update is required.
5. [N/A] Review change with Overture technical writer to ensure any advanced documentation needs will be taken care of, unless the change is trivial and would not affect the documentation.

Documentation Website

(Doesn't affect the docs)
Docs preview for this PR.

[vcschapp]

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