d5537c18a9 fuzz: make sure DecodeBase58(Check) is called with valid values more often (Lőrinc)
bad1433ef2 fuzz: Always restrict base conversion input lengths (Lőrinc)
Pull request description:
This is a follow-up to https://github.com/bitcoin/bitcoin/pull/30746, expanding coverage by:
* restricting every input for the base58 conversions, capping max sizes to `100` instead of `1000` or all available input (suggested by marcofleon in https://github.com/bitcoin/bitcoin/pull/30746#discussion_r1963718683) since most actual usage has lengths of e.g. `21`, `34`, `78`.
* providing more valid values to the decoder (suggested by maflcko in https://github.com/bitcoin/bitcoin/pull/30746#discussion_r1957847712) by randomly providing a random input or a valid encoded one; this also enables unifying the roundtrip tests to a single roundtrip per fuzz.
ACKs for top commit:
mzumsande:
Code Review / lightly tested ACK d5537c18a9
maflcko:
review ACK d5537c18a9🚛
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