feat: Add support for a new architecture loongarch

[zevanzhao]

Description

In this commit, support for a new architecture Loongarch is added to mamba. LoongArch is a new RISC ISA, which is a bit like MIPS or RISC-V. Loongarch has been added to Debian port since August 2023. So supporting this new architecture is necessary for conda/mamba users on Loongarch.
https://wiki.debian.org/LoongArch
https://lists.debian.org/debian-devel-announce/2023/08/msg00000.html
https://www.kernel.org/doc/html/v6.1//loongarch/introduction.html

Type of Change

• Bugfix
• Feature / enhancement
• CI / Documentation
• Maintenance

Checklist

• My code follows the general style and conventions of the codebase, ensuring consistency
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run pre-commit run --all locally in the source folder and confirmed that there are no linter errors.
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes

[AntoinePrv]

I see there is precedence for the name in the Conda ecosystem:

• https://github.com/conda/rattler/blob/713da62ee363574b72f7c3cd5931949f9f69cd2f/crates/rattler_conda_types/src/platform.rs#L107
• https://github.com/conda/conda-lock/blob/e0212281d486ae4603b9f26f8266eaa4e1738b3f/conda_lock/_vendor/poetry/core/_vendor/packaging/_manylinux.py#L66

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.15%. Comparing base (2ee50e0) to head (a9cd0c8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4019   +/-   ##
=======================================
  Coverage   64.14%   64.15%           
=======================================
  Files         303      303           
  Lines       38853    38858    +5     
  Branches     2883     2883           
=======================================
+ Hits        24923    24928    +5     
  Misses      13863    13863           
  Partials       67       67           

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[zevanzhao]

I see there is precedence for the name in the Conda ecosystem:

* https://github.com/conda/rattler/blob/713da62ee363574b72f7c3cd5931949f9f69cd2f/crates/rattler_conda_types/src/platform.rs#L107

* https://github.com/conda/conda-lock/blob/e0212281d486ae4603b9f26f8266eaa4e1738b3f/conda_lock/_vendor/poetry/core/_vendor/packaging/_manylinux.py#L66

You are right. The support for loongarch64 in rattler is accepted two months ago.