Add Support Platform for LoongArch

[CoolPlayLin]

I'd like wezterm add new build for LoongArch to bring it to loongArch's user so that they'll have native experiences.

• Rust has already supported for LoongArch in Add support for the LoongArch architecture rust-lang/compiler-team#518 since 1.17.0 version

This architecture already has a small but growing user base in China, that mainly consists of software porters and hobbyist end-users for now (June 2022). Growth is expected to continue in the coming years, expanding to the general consumer market. The architecture is capable of full-fledged desktop and server workload alike, in addition to SoC models intended for embedded.

[github-actions]

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