🥕[Bug]: JSON Schema: Inaccurate Required/Not-Required constraints

Discrepancies exist between the official Data API Builder documentation and the JSON schema regarding the required status of certain properties. The documentation is correct and highlights where the schema needs to be adjusted.

## Required Properties NOT Required in Schema

1. **`data-source.options.database`** (for `cosmosdb_nosql`)
- **Docs:** Required when `database-type` is `cosmosdb_nosql`.
- **Schema:** Not marked as required.

2. **`data-source.options.schema`** (for `cosmosdb_nosql`)
- **Docs:** Required when `database-type` is `cosmosdb_nosql`.
- **Schema:** Not marked as required.

3. **`entities..source.key-fields`**
- **Docs:** Required **only** when `type` is `view`.
- **Schema:** Not conditionally marked as required.

4. **`entities..permissions`**
- **Docs:** Required for defining access controls for the entity.
- **Schema:** Not marked as required.

## Not-Required Properties REQUIRED in Schema

1. **`runtime.rest.enabled`**
- **Docs:** Optional; defaults to `true`.
- **Schema:** Marked as required.

2. **`runtime.graphql.enabled`**
- **Docs:** Optional; defaults to `true`.
- **Schema:** Marked as required.

## Suggested Fix

1. **For `cosmosdb_nosql` Configuration:**

```json
{
"if": {
"properties": { "database-type": { "const": "cosmosdb_nosql" } }
},
"then": {
"properties": {
"options": {
"required": ["database", "schema"]
}
}
}
}
```

2. **For Entity Definitions:**

```json
{
"patternProperties": {
"^[a-zA-Z0-9_-]+$": {
"properties": {
"source": {
"properties": {
"type": { "type": "string" },
"key-fields": { "type": "array" }
},
"required": ["type"],
"allOf": [
{
"if": {
"properties": { "type": { "const": "view" } }
},
"then": { "required": ["key-fields"] }
}
]
},
"permissions": { "type": "array" }
},
"required": ["source", "permissions"]
}
}
}
```

3. **For Runtime Configuration:**

```json
{
"properties": {
"runtime": {
"properties": {
"rest": {
"properties": {
"enabled": { "type": "boolean", "default": true }
}
},
"graphql": {
"properties": {
"enabled": { "type": "boolean", "default": true }
}
}
}
}
}
}
```

Das Issue nennt weder eine Schema-Datei noch einen Test-Einstiegspunkt. Finde das für die Konfiguration von Data API Builder verwendete JSON Schema, vergleiche dessen erforderliche Eigenschaften und Standardwerte mit der offiziellen Dokumentation und validiere anschließend die bedingten Regeln für Cosmos DB, View-Entitäten, Berechtigungen und Laufzeit-Flags.

Vom Indexierungsmodell aus dem Issue-Text verfasst.