Binary release names are misleading, specially x32
### Description

`x32` means [32-bit pointers on 64-bit CPU](https://en.wikipedia.org/wiki/X32_ABI) and is used to save memory on 64-bit systems that come with less than 4gb of memory. `x64` is kind of better, but the proper name for this one is usually `x86_64`.

As is, the names are neither derived from the `--cpu` flag (whose values are nim-specific and therefore less useful in the toolchain world), nor does it match "target triples" (what modern toolchains uses) - any of these two sources would be an improvement on the status quo - ie `amd64` vs `x86_64`, with a preference for the latter since that would move us in a direction of simplifying interaction with the rest of the toolchain world.

Further, this would also set a standard that all "binary tools" can use (nimble etc), so that `tool-platform.tar.gz` becomes a "standard" name for getting a binary release of `tool`.

### Nim Version

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### Current Output

_No response_

### Expected Output

_No response_

### Known Workarounds

_No response_

### Additional Information

_No response_