feat(unixfs/mfs): support MaxLinks and MaxHAMTFanout

CHANGELOG.md

@@ -16,6 +16,12 @@ The following emojis are used to highlight certain changes:
 
 ### Added
 
+- `ipld/unixfs/io/directory`: We have made some changes to unixfs directory tooling:
+  - We have exposed creator methods for new `BasicDirectory` and `HAMTDirectory`, that complement the existing `NewDirectory()` which creates dynamic directories.
+  - We have added `WithCidBuilder(...)`, `WithMaxLinks(...)`, `WithMaxHAMTFanout(...)` and `WithStat(...)` as options to these new methods so that empty directories can be initilized as wished from the get-go.
+  - `WithMaxLinks(...)` and `WithMaxHAMTFanout(...)` are new options that allow to set a limit to the number of children that a directory DAG node can have. For details on what they exactly do for each of the directory type, please check the documentation.
+- `mfs` supports as well the new `MaxLinks` and `MaxHAMTFanout` options. They have been made part of the `MkdirOptions` object and the methods `NewEmptyDirectory()` and `NewEmptyRoot()` have been added to facilitate the initialization of MFS objects.
+
 ### Changed
 
 - upgrade to `go-libp2p` [v0.41.1](https://github.com/libp2p/go-libp2p/releases/tag/v0.41.1)