sui-field-count: const instead of fn and use it in sui-indexer-alt

[gegaowp]

Description

• change field_count trait from fn to const as we want to use it as part of const def
• use it in sui-indexer-alt

Test plan

1. existing tests for sui-field-count
2. for replacements, I added temp tests to ensure the values before and after were the same, removed them afterwards to avoid unnecessary changes later on when we change struct definition

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[amnn]

Thanks @gegaowp -- the change from a function to a constant looks good, but the integration needs some tweaking, PTAL.

[amnn]

Some smaller suggestions (and a spurious extra commit), but this is shaping up in a positive direction, thanks @gegaowp !

[amnn]

LGTM, thanks @gegaowp ! Just one comment to avoid the duplication for calculating max_chunk_rows (without allowing people to override it).