Feature Request: Support YAML Array Length Counting

[Bribruh123]

Feature Request: Support YAML Array Length Counting

Summary

Add YAML array length counting to the Data Size Count extension. The extension should display the number of elements in a selected YAML array, similar to its existing data-size counting capabilities.

Example

Given this YAML:

tenants:
  - name: a
  - name: b
  - name: c

When the user selects the tenants array, Data Size Count should report:

Array Length: 3

The feature should also support inline arrays:

environments: [development, testing, production]

Expected count:

Array Length: 3

Expected Behavior

• Detect when the selected YAML value is an array.
• Count only the array’s top-level elements.
• Return 0 for an empty array.
• Support arrays containing strings, numbers, objects, or nested arrays.
• Treat each nested array or object as one top-level element.
• Show a clear message when the selection is not a valid YAML array.
• Support both block-style and flow-style YAML arrays.

Use Cases

This feature would help users quickly:

• Check the number of entries in configuration arrays.
• Validate large YAML configuration files.
• Count tenants, endpoints, policies, hosts, or other repeated resources.
• Verify generated YAML without manually counting entries.

Acceptance Criteria

• Data Size Count recognizes valid YAML arrays.
• Block-style YAML arrays are supported.
• Inline YAML arrays are supported.
• Empty arrays return a count of 0.
• Nested values are counted by their top-level array entries.
• Invalid YAML produces a useful error message.
• The count is accessible through the existing Data Size Count command or interface.
• Automated tests cover empty, populated, inline, nested, and invalid YAML arrays.