Add jishaku.main to setup #406

Job	Run time
ubuntu-latest CPython 3.10 with pypi discord.py	1m 5s
ubuntu-latest CPython 3.10 with git discord.py	1m 8s
ubuntu-latest CPython 3.11 with pypi discord.py	57s
ubuntu-latest CPython 3.11 with git discord.py	1m 1s
windows-latest CPython 3.10 with pypi discord.py	1m 45s
windows-latest CPython 3.10 with git discord.py	1m 59s
windows-latest CPython 3.11 with pypi discord.py	1m 58s
windows-latest CPython 3.11 with git discord.py	1m 51s
macos-latest CPython 3.10 with pypi discord.py	1m 57s
macos-latest CPython 3.10 with git discord.py	1m 49s
macos-latest CPython 3.11 with pypi discord.py	1m 8s
macos-latest CPython 3.11 with git discord.py	1m 12s
upload_pypi	0s
	17m 50s

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