hashindex types: remove some unused stuff

src/borg/hashindex.pyi

@@ -39,9 +39,6 @@ class ChunkKeyIterator:
 class ChunkIndex(IndexBase):
     def add(self, key: bytes, refs: int, size: int) -> None: ...
     def iteritems(self, marker: bytes = ...) -> Iterator: ...
-    def stats_against(self, master_index) -> Tuple: ...
-    def summarize(self) -> Tuple: ...
-    def zero_csize_ids(self) -> int: ...
     def __contains__(self, key: bytes) -> bool: ...
     def __getitem__(self, key: bytes) -> Type[ChunkIndexEntry]: ...
     def __setitem__(self, key: bytes, value: CIE) -> None: ...
@@ -61,22 +58,14 @@ class NSIndex(IndexBase):
     def __contains__(self, key: bytes) -> bool: ...
     def __getitem__(self, key: bytes) -> Any: ...
     def __setitem__(self, key: bytes, value: Any) -> None: ...
-    def flags(self, key: bytes, mask: int, value: int = None) -> int: ...
 
 class NSIndex1(IndexBase):  # legacy
     def iteritems(self, *args, **kwargs) -> Iterator: ...
     def __contains__(self, key: bytes) -> bool: ...
     def __getitem__(self, key: bytes) -> Any: ...
     def __setitem__(self, key: bytes, value: Any) -> None: ...
-    def flags(self, key: bytes, mask: int, value: int = None) -> int: ...
 
 class FuseVersionsIndex(IndexBase):
     def __contains__(self, key: bytes) -> bool: ...
     def __getitem__(self, key: bytes) -> Any: ...
     def __setitem__(self, key: bytes, value: Any) -> None: ...
-
-class CacheSynchronizer:
-    size_totals: int
-    num_files_totals: int
-    def __init__(self, chunks_index: Any) -> None: ...
-    def feed(self, chunk: bytes) -> None: ...