Represents a Zstandard dictionary.
dict_content
The content of a Zstandard dictionary as a bytes-like object.
is_raw
If true, perform no checks on *dict_content*, useful for some
advanced cases. Otherwise, check that the content represents
a Zstandard dictionary created by the zstd library or CLI.
The dictionary can be used for compression or decompression, and can be
shared by multiple ZstdCompressor or ZstdDecompressor objects.