feat(macos-amd64): Add Intel-based macOS as target (ESPTOOL-957)

[lucasssvaz]

Arduino and many other applications still require x86_64 binaries for MacOS. We will need these binaries for releasing important updates like ESP32-P4 support in Arduino.

This PR adds the macos-amd64 target for the esptool, making it available to Intel-based CPUs on MacOS.

Ideally the current macos target should be renamed to macos-arm64 for consistency but it will be a breaking change, so it can be postponed until a new major release.

This change fixes the following bug(s):

No recent available esptool for MacOS Intel CPUs.

I have run the esptool.py automated integration tests with this change and the above hardware:

Tested in fork with CI.

[github-actions]

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