Add option to force warmup (or no warmup)

[LilithHafner]

I used warmup with true,false, and nothing as options rather than force_warmup with true and false as options because

• It is more concise
• It is actually sometimes reasonable to force no-warmup, specifically if the computation is slow and pre-warmed.

[LilithHafner]

Regressiontests.jl found an unacceptable Chairmarks performance regression

Increase
ttfx_excl_load_time
@ /home/runner/work/Chairmarks.jl/Chairmarks.jl/bench/runbenchmarks.jl:12
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comparison      ▄                                                        
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∞ 0 < └0.133766                                           2.64779┘ < ∞ N

[LilithHafner]

Regressions are acceptable. There is already dynamic dispatch here and the regressions are small.