feat(collections): add SignalMap and SignalSet utility (#657)

* feat(collections): add `SignalMap` utility with comprehensive tests and documentation

Introduced the `SignalMap` utility within the `ngxtension/collections` library to provide fine-grained reactive map functionality using Angular's signals system. Includes rich API capabilities, thorough test coverage, and extensive documentation.

* feat(collections): add `SignalSet` utility with detailed tests and documentation

Introduced the `SignalSet` utility to the `ngxtension/collections` library for reactive set management using Angular's signals system. Completed with a full API, extensive documentation, and comprehensive test suite.

Author: eneajaho

docs/src/content/docs/utilities/Collections/signal-map.md

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+# ngxtension/collections
+
+Secondary entry point of `ngxtension`. It can be used by importing from `ngxtension/collections`.

docs/src/content/docs/utilities/Collections/signal-set.md

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+{
+	"lib": {
+		"entryFile": "src/index.ts"
+	}
+}

libs/ngxtension/collections/README.md

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+{
+	"name": "ngxtension/collections",
+	"$schema": "../../../node_modules/nx/schemas/project-schema.json",
+	"projectType": "library",
+	"sourceRoot": "libs/ngxtension/collections/src",
+	"targets": {
+		"test": {
+			"executor": "@nx/jest:jest",
+			"outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+			"options": {
+				"jestConfig": "libs/ngxtension/jest.config.ts",
+				"testPathPattern": ["collections"],
+				"passWithNoTests": true
+			},
+			"configurations": {
+				"ci": {
+					"ci": true,
+					"codeCoverage": true
+				}
+			}
+		},
+		"lint": {
+			"executor": "@nx/eslint:lint",
+			"outputs": ["{options.outputFile}"]
+		}
+	}
+}

libs/ngxtension/collections/ng-package.json

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+export { SignalMap } from './signal-map';
+export { SignalSet } from './signal-set';