Yggdrasil Proxy

to 1.21.1

to 1.21.9

• Support 1.21.5

• When ProfileCached is already installed, skip YggdrasilProxy's Mixin.

• Support Neoforge

• The proxy package has been moved to the external dependency library, so do not maintain multiple identical codes at the same time.

• Due to the lack of the corresponding test environment, the logic of Darwin and Linux is temporarily consistent.