Add size_hint methods to Arbitrary impls #1239
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What
Add size_hint methods to Arbitrary impls.
Why
It should make fuzzers more effective at producing arbitrary input, particularly in cases where these types are included in structs or collections.
Known limitations
Note that the
impl Arbitrary for Symboldoesn't need an implementation - the default(0, None)is appropriate.Closes stellar/rs-soroban-sdk#1147