Integrate BigDecimal_div and BigDecimal_div2 #407

Job	Run time
ruby-versions / Generate Ruby versions	2s
ubuntu-latest 2.7	1m 1s
ubuntu-latest 3.0	33s
ubuntu-latest 3.1	36s
ubuntu-latest 3.2	37s
ubuntu-latest 3.3	35s
ubuntu-latest 3.4	38s
ubuntu-latest debug	43s
ubuntu-latest head	26s
macos-latest 2.7	1m 2s
macos-latest 3.0	36s
macos-latest 3.1	52s
macos-latest 3.2	32s
macos-latest 3.3	33s
macos-latest 3.4	23s
macos-latest debug	34s
macos-latest head	23s
macos-14 2.7	1m 0s
macos-14 3.0	30s
macos-14 3.1	44s
macos-14 3.2	25s
macos-14 3.3	22s
macos-14 3.4	25s
macos-14 debug	35s
macos-14 head	33s
windows-latest 2.7	3m 54s
windows-latest 3.3	2m 25s
windows-latest 3.4	2m 10s
windows-latest head	2m 2s
windows-latest mingw	1m 59s
windows-latest mswin	1m 41s
	28m 51s

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