… properties BM-1268 (#3440)

1. This pull request extends the [feat/etl-create] branch, not the
[master] branch.
2. The changed files contain short-circuiting code to enable faster
debugging that needs to be purged before approval.

---

### Motivation

We are currently migrating our Vector ETL system into basemaps as a new
`cli-vector` package. We are also re-building the system in the process.
As a part of the re-build, we have streamlined the system's architecture
in the following four steps:

1. `extract`
2. `create`
3. `join`
4. `analyse`

This work implements an extension to the base branch's implementation of
the `create` CLI command. This work introduces a series of functions for
handling dataset features of specific Shortbread layers for which we
require special tagging.

### Modifications

| Diagram |
| - |
| ![][diagram1] |

1. Implements a switch-style pattern for identifying the Shortbread
layer to which a feature is assigned.
2. Implements bespoke functions for overriding a feature's metadata and
properties for the following Shortbread layers:
   - `contours`
- `place_labels` - This one is weird. We will need to discuss the
approach for this one.
- `pois` - This one doesn't actually do anything as it never receives
any features that will meet its conditions for special tagging. We can
discuss this also.
   - `public_transport`
- `street_labels` - This one's logic is very similar to the `streets`
logic.
- `streets` - This one's logic is very similar to the `street_labels`
logic.
   - `water_polygons`

#### Processing a Vector Stac Item

The system processes a Stac Item file created via the **cli-vector**
package's new `extract` command like so:

1. Parse the file as a runtime `VectorStacItem` type.
2. Download the source file (i.e. a GeoPackage file).
3. Convert the source file into an NDJSON file.
4. Parse each line (i.e. feature) of the NDJSON file, generalise it
(i.e. simplify, add/remove attributes, or discard).
5. Process the collection of generalised features into an mbtiles file.
6. Upload a copy of the mbtiles file to the same directory as the Stac
Item file.
7. Update the Stac Item file's contents and overwrite it.

| Diagram |
| - |
| ![][diagram2] |

### Verification

1. Established test cases for the special tagging functions for the
following Shortbread layers:
   - `contours`

More to come if desired.

<!-- external links -->

[feat/etl-create]: https://github.com/linz/basemaps/tree/feat/etl-create
[master]: https://github.com/linz/basemaps/tree/master

[diagram1]:
https://github.com/user-attachments/assets/6a405417-59fb-4127-8630-cb0901c12618
[diagram2]:
https://github.com/user-attachments/assets/2994bd5d-c668-4b99-957e-57623da7c6a1

---------

Co-authored-by: Wentao Kuang <[email protected]>

…on metrics

Co-authored-by: Tawera Manaena <[email protected]>