feat: Add 'listAllMappings' action for comprehensive route inspection

[JS-AK]

Description

This PR introduces a new internal action listAllMappings to the API Gateway service. This action provides a complete list of all available API endpoints, aggregating both explicitly defined aliases and automatically generated routes (from mappingPolicy: 'all').

Why

Currently, it's difficult to get a full picture of all exposed endpoints, especially when using a mix of aliases and auto-mapped routes. This new action helps developers debug their API surface and can be used as a data source for generating API documentation or service discovery tools.

Features

• Lists all explicit aliases.
• Computes and lists all implicit routes generated by mappingPolicy: 'all'.
• Supports grouping by route.
• Can include full action schemas in the response.
• Respects whitelist/blacklist and action visibility settings.
• Correctly handles internal service names (replacing $ with configured special char).

Example Usage

call api.listAllMappings { grouping: true }