Refactor package structure and update tests

- Updated the package name in pyproject.toml for the Cython extension to "tree_sitter_languages.core".
- Added a new __init__.py file in the tests directory.
- Removed "perl" from the LANGUAGES list in test_tree_sitter_languages.py.
- Adjusted import statements in tree_sitter_languages/__init__.py to reflect the new package structure and defined __all__ for public API.

These changes improve the organization and clarity of the package structure and tests.

pyproject.toml

@@ -35,7 +35,7 @@ build-backend = "setuptools.build_meta"
 packages = ["tree_sitter_languages"]
 package-data = {"tree_sitter_languages" = ["languages.so", "languages.dll"]}
 ext-modules = [
-    {name = "tree_sitter_languages", sources = ["tree_sitter_languages/core.pyx"]}
+    {name = "tree_sitter_languages.core", sources = ["tree_sitter_languages/core.pyx"]}
 ]
 
 [tool.cython]

tests/test_tree_sitter_languages.py

@@ -33,7 +33,6 @@
     "markdown",
     "objc",
     "ocaml",
-    "perl",
     "php",
     "python",
     "ql",

tree_sitter_languages/__init__.py

@@ -3,4 +3,6 @@
 Does not support tree-sitter v0.22.0 and above.
 """
 
-from .core import get_language, get_parser
+from tree_sitter_languages.core import get_language, get_parser
+
+__all__ = ["get_language", "get_parser"]