CrudApiPlugin: Support query string parameters in actions

[Copilot]

CrudApiPlugin actions only matched on URL path segments. Query string parameter filtering (e.g., GET /jokes?category=azure) was not possible.

Changes

• Split action URL into path and query parts at ? delimiter
• Match path against request path (preserving existing behavior)
• Match query parameters individually using HttpUtility.ParseQueryString — order-independent
• Support parameterized values ({param}) extracted into the parameters dictionary for JSONPath substitution
• Support literal query values with exact-match validation

Example

{
  "action": "getMany",
  "url": "?category={category}",
  "query": "$.[?(@.categories[?(@ == '{category}')])]"
}

GET /baseUrl?category=azure extracts azure as {category} and substitutes it into the JSONPath query to filter matching items.