simplify_rules.jl: Add rules for sinh, cosh

[eschnett]

Add rules for sinh, cosh, similar to those for sin and cos.

[github-actions]

Benchmark Results

	master	04ef715...	t[master]/t[04ef715...]
overhead/acrule/a+2	1.09 ± 0.24 μs	1.05 ± 0.26 μs	1.04
overhead/acrule/a+2+b	1.08 ± 0.25 μs	1.03 ± 0.2 μs	1.05
overhead/acrule/a+b	0.349 ± 0.0061 μs	0.354 ± 0.014 μs	0.985
overhead/acrule/noop:Int	26.5 ± 0.6 ns	26.8 ± 1.2 ns	0.989
overhead/acrule/noop:Sym	0.0453 ± 0.0074 μs	0.0482 ± 0.0077 μs	0.94
overhead/rule/noop:Int	0.0444 ± 0.0013 μs	0.0446 ± 0.0011 μs	0.995
overhead/rule/noop:Sym	0.0582 ± 0.0024 μs	0.0682 ± 0.0023 μs	0.853
overhead/rule/noop:Term	0.0593 ± 0.0022 μs	0.0682 ± 0.0022 μs	0.869
overhead/ruleset/noop:Int	0.165 ± 0.0022 μs	0.162 ± 0.002 μs	1.02
overhead/ruleset/noop:Sym	0.191 ± 0.0051 μs	0.18 ± 0.0051 μs	1.06
overhead/ruleset/noop:Term	4.26 ± 0.26 μs	4.31 ± 0.26 μs	0.987
overhead/simplify/noop:Int	0.224 ± 0.005 μs	0.234 ± 0.0082 μs	0.956
overhead/simplify/noop:Sym	0.235 ± 0.0036 μs	0.25 ± 0.0038 μs	0.941
overhead/simplify/noop:Term	0.0443 ± 0.0035 ms	0.0444 ± 0.0039 ms	0.998
overhead/simplify/randterm (+, *):serial	0.123 ± 0.0018 s	0.121 ± 0.0025 s	1.02
overhead/simplify/randterm (+, *):thread	0.0777 ± 0.017 s	0.0755 ± 0.018 s	1.03
overhead/simplify/randterm (/, *):serial	0.274 ± 0.0079 ms	0.273 ± 0.0082 ms	1
overhead/simplify/randterm (/, *):thread	0.317 ± 0.01 ms	0.309 ± 0.0095 ms	1.03
overhead/substitute/a	0.0723 ± 0.0014 ms	0.0718 ± 0.0014 ms	1.01
overhead/substitute/a,b	0.0631 ± 0.0015 ms	0.0636 ± 0.0016 ms	0.992
overhead/substitute/a,b,c	22.6 ± 0.4 μs	23.5 ± 0.5 μs	0.962
polyform/easy_iszero	0.0379 ± 0.0031 ms	0.0379 ± 0.0023 ms	1
polyform/isone	3.4 ± 0 ns	3 ± 0.1 ns	1.13
polyform/iszero	1.57 ± 0.03 ms	1.54 ± 0.031 ms	1.02
polyform/simplify_fractions	2.22 ± 0.038 ms	2.18 ± 0.042 ms	1.02
time_to_load	5.28 ± 0.028 s	5.25 ± 0.0072 s	1.01

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[shashi]

could you add a few tests?

[shashi]

You also want to edit https://github.com/JuliaSymbolics/SymbolicUtils.jl/blob/master/src/utils.jl#L37

otherwise this ruleset will not be applied.

[eschnett]

@shashi Did that – could you let the CI workflows run again?

[eschnett]

The test failure seems unreladed.

[shashi]

@YingboMa failure related to #535