Make DEFAULT_KIND Configurable.

[T-256]

>rye toolchain register C:\python37x86\python.exe --name 32
Registered C:\python37x86\python.exe as 32@3.7.9

>rye toolchain list
32@3.7.9 (C:\python37x86\python.exe)

>rye pin 3.7
pinned 3.7.9 in .python-version

when use rye sync it's going to download cpython@3.7.9. there is already version 3.7.9 in toolchains and expect to use 32@3.7.9 toolchain. if not found any available version it can go to download cpython as current behavior.

[mitsuhiko]

Today the default is cpython. If you register with the name cpython you will prevent the automatic fetching. There is nothing better yet other than to be explicit about the name otherwise. What kind of behavior would make sense?

[T-256]

If you register with the name cpython you will prevent the automatic fetching.

ah right, I completely forgot it.

What kind of behavior would make sense?

IMO it could be global option for pypy users, or 32bit users of cpython like me :) (I have 32bit versions under "32" name)

[behavior]
default_kind = "pypy"