Combine multiple str.minhash() APIs into one call

[davidwendt]

Description

The following cudf strings minhash APIs are combined into a single method call:

minhash() - substring with 32-bit hash
minhash64() - substring with 64-bit hash
minhash_ngrams() - ngrams of strings list with 32-bit hash
minhash64_ngrams() - ngrams of strings list with 64-bit hash

The single API is minhash(self, seed, a, b, width) where the dtype of seed/a/b determines 32-bit vs 64-bit and the type of self (list or strings) determines substring vs ngrams.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[davidwendt]

/ok to test