Add Linux ARM64 support

[ashao]

Description

We currently include support for ARM64 on macOS only, however with the increasing availability of other ARM64-based chips, this support should be extended to Linux as well.

Justification

This support is necessary for the next generation supercomputers that may have ARM64-based architectures and/or early adopters of ARM64 on Linux.

Implementation Strategy

Based on a quick test, the main changes that need to be made to SmartSim are focused on the RedisAI build. Namely,

• Update the Architecture enums to resolve aarch64 to ARM64 as well
• Create a new LinuxARM64 config file
• For the above, it might be more general if we can specify that aarch64 and arm64 are equivalent