New apply methods, types for left_overlaps(); new big-position feat…

…ure.

 - New `--feature=big-position` added for u64 `Position` support, for
   large chromosomes.
 - Many new `left_overlaps()` join methods and types to handle all
   possible cases of range overlaps and downstream apply operation
   on left and right combinations of `GRanges` and `GRangesEmpty`
   objects.

Cargo.toml

@@ -33,6 +33,7 @@ dev-commands = [ ]
 test_bigranges = [] # NOTE: not used yet, for tests on large files
 polars = ["dep:polars"]
 ndarray = ["dep:ndarray", "dep:ndarray-npy"]
+big-position = []
 
 [profile.release]
 opt-level = 3