Bind hb_face_count APIs

src/uharfbuzz/_harfbuzz.pyx

@@ -600,6 +600,10 @@ cdef class Face:
         inst._reference_table_func = func
         return inst
 
+    @property
+    def count(self) -> int:
+        return hb_face_count(self._blob._hb_blob)
+
     @property
     def index(self) -> int:
         return hb_face_get_index(self._hb_face)

src/uharfbuzz/charfbuzz.pxd

@@ -226,6 +226,7 @@ cdef extern from "hb.h":
     hb_face_t* hb_face_create_for_tables(
         hb_reference_table_func_t reference_table_func,
         void* user_data, hb_destroy_func_t destroy)
+    unsigned int hb_face_count(hb_blob_t* blob)
     unsigned int hb_face_get_index(const hb_face_t* face)
     void hb_face_set_index(hb_face_t* face, unsigned int index)
     unsigned int hb_face_get_upem(hb_face_t* face)

tests/test_uharfbuzz.py

@@ -231,6 +231,7 @@ class TestFace:
     def test_properties(self, blankfont):
         face = blankfont.face
 
+        assert face.count > 0
         assert face.index == 0
         assert face.upem == 1000
         assert face.glyph_count == 9