Add type annotations

`wheel` does not read from MANIFEST.in - the stub
and marker files need to also be added as
`package_data` in setup.py.

MANIFEST.in

@@ -1,2 +1,2 @@
-include LICENSE *.rst *.py cjellyfish/*.c cjellyfish/*.h docs/* testdata/*
+include LICENSE *.rst *.py *.pyi py.typed cjellyfish/*.c cjellyfish/*.h docs/* testdata/*
 global-exclude .git

jellyfish/__init__.pyi

@@ -0,0 +1,11 @@
+def levenshtein_distance(s1: str, s2: str) -> int: ...
+def jaro_similarity(s1: str, s2: str) -> float: ...
+def jaro_winkler_similarity(s1: str, s2: str, long_tolerance: bool = ...) -> float: ...
+def damerau_levenshtein_distance(s1: str, s2: str) -> int: ...
+def soundex(s: str) -> str: ...
+def hamming_distance(s1: str, s2: str) -> int: ...
+def nysiis(s: str) -> str: ...
+def match_rating_codex(s: str) -> str: ...
+def match_rating_comparison(s1: str, s2: str) -> bool: ...
+def metaphone(s: str) -> str: ...
+def porter_stem(s: str) -> str: ...

setup.py

@@ -80,8 +80,6 @@ class TestCommand(Command):
 
 
 def run_setup(build_c):
-    kw = {}
-
     if build_c:
         kw = dict(
             ext_modules=[
@@ -103,10 +101,9 @@ def run_setup(build_c):
                 )
             ],
             cmdclass=dict(build_ext=ve_build_ext, test=TestCommand),
-            packages=["jellyfish"],
         )
     else:
-        kw = dict(cmdclass=dict(test=TestCommand), packages=["jellyfish"])
+        kw = dict(cmdclass=dict(test=TestCommand))
 
     with open("README.rst") as readme:
         long_description = readme.read()
@@ -135,6 +132,8 @@ def run_setup(build_c):
             "Programming Language :: Python :: 3.9",
             "Topic :: Text Processing :: Linguistic",
         ],
+        packages=["jellyfish"],
+        package_data={"jellyfish": ["*.pyi", "py.typed"]},
         **kw
     )