Add interface_checks to allowed keywords

[ChrisRackauckas]

Summary

• Added interface_checks to the list of allowed keyword arguments in solve
• This keyword was already documented in SciMLBase.jl PR check isinplace before replacing cache in SplitFunction #561 but was missing from DiffEqBase's allowed keywords list

Test plan

• Verified that using interface_checks = false no longer throws an unrecognized keyword error
• All existing tests pass

Example

Previously this would error:

using OrdinaryDiffEq
ode = ODEProblem((u, p, t) -> u, 1.0, (0.0, 1.0))
solve(ode; interface_checks = false)  # ERROR: Unrecognized keyword arguments

Now it's properly recognized as a valid keyword.

Fixes #980

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