Implement exp, log, power and ** in ruby #442

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-latest 2.7	1m 2s
ubuntu-latest 3.0	33s
ubuntu-latest 3.1	34s
ubuntu-latest 3.2	37s
ubuntu-latest 3.3	37s
ubuntu-latest 3.4	33s
ubuntu-latest debug	44s
ubuntu-latest head	34s
macos-latest 2.7	56s
macos-latest 3.0	24s
macos-latest 3.1	29s
macos-latest 3.2	22s
macos-latest 3.3	22s
macos-latest 3.4	20s
macos-latest debug	26s
macos-latest head	22s
macos-14 2.7	58s
macos-14 3.0	24s
macos-14 3.1	28s
macos-14 3.2	25s
macos-14 3.3	20s
macos-14 3.4	21s
macos-14 debug	28s
macos-14 head	23s
windows-latest 2.7	6m 2s
windows-latest 3.3	3m 16s
windows-latest 3.4	3m 30s
windows-latest head	3m 32s
windows-latest mingw	3m 6s
windows-latest mswin	2m 36s
	34m 47s

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