Automatically call PrecomputeUnitSpeedData inside of SolveBulk if it would benefit performance

[toadative]

Immediate thoughts:

• Alternatively, raise a warning to the developer that they should call PrecomputeUnitSpeedData
• Exposing this functionality to the user would be hard.
• As a rule of thumb, you should call PrecomputeUnitSpeedData if the number of reparametrizations you're doing will be greater than the degree of the Chebyshev interpolant.