Implement exp, log, power and ** in ruby #466

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-latest 2.7	1m 6s
ubuntu-latest 3.0	35s
ubuntu-latest 3.1	33s
macos-latest 2.7	1m 13s
ubuntu-latest head	35s
ubuntu-latest debug	45s
ubuntu-latest 3.4	35s
macos-latest 3.1	36s
macos-latest 3.0	37s
ubuntu-latest 3.3	39s
macos-latest 3.2	33s
ubuntu-latest 3.2	36s
macos-14 3.0	23s
macos-latest 3.3	26s
macos-latest 3.4	24s
macos-14 2.7	1m 12s
macos-latest head	27s
macos-14 3.2	29s
macos-14 debug	33s
macos-14 3.1	41s
macos-14 3.4	25s
macos-14 3.3	22s
macos-14 head	31s
windows-latest mingw	2m 14s
windows-latest 3.4	2m 15s
windows-latest head	2m 10s
windows-latest 3.3	2m 46s
windows-latest 2.7	3m 40s
windows-latest mswin	1m 46s
macos-latest debug	44s
	29m 55s

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