[Upstream] deal_provider_collateral_bounds improvements.

[ruseinov]

1. Take a more readable approach for the method.

2. Perhaps introduce that same method for actors v8..v10.

   You're welcome to propose a change in the upstream https://github.com/filecoin-project/builtin-actors to address readability.

_Originally posted by @LesnyRumcajs in https://github.com/ChainSafe/fil-actor-states/pull/272#discussion_r1551491575_