refactor(*): migrate to parse5 to reduce dependency (#318)

This pull request refactors the HTML parsing logic in the
`textlint-rule-allowed-uris` rule to use the `parse5` library instead of
`cheerio`, improving standards compliance and reliability. The main
changes include updating dependencies, rewriting the HTML node handler,
and adding new helper functions and tests.

**Dependency update:**

* Replaced the `cheerio` dependency with `parse5` in `package.json` to
use a more robust HTML parser.

**Refactoring HTML parsing:**

* Rewrote the import statements and added type imports for `parse5` in
`src/textlint-rule-allowed-uris.js`.
[[1]](diffhunk://#diff-7da72e1e0d5c49a43b94f9d928d3157918c0bdcc3121c5ed14e0bc459b3f26f9L10-R10)
[[2]](diffhunk://#diff-7da72e1e0d5c49a43b94f9d928d3157918c0bdcc3121c5ed14e0bc459b3f26f9R19)
* Added a new helper function `getElementsByTagName` to recursively find
elements by tag name in HTML fragments using `parse5`.
* Refactored the `Html` node handler to use `getElementsByTagName` for
extracting `href` and `src` attributes from `<a>` and `<img>` tags,
replacing the previous cheerio-based approach.

**Testing improvements:**

* Added new test cases to ensure correct handling of HTML nodes with
various tag and attribute casing, improving coverage for the new parsing
logic.

Author: lumirlumir

package-lock.json

@@ -96,6 +96,6 @@
     "typescript": "^5.9.2"
   },
   "dependencies": {
-    "cheerio": "^1.1.2"
+    "parse5": "^8.0.0"
   }
 }