feat: add native bridge support for ARM apps

[Shmayro]

Summary

• install libndk native bridge during first boot to run ARM-only APKs
• enable native bridge feature in emulator startup
• document ARM app support in README

Testing

• bash -n first-boot.sh
• bash -n start-emulator.sh

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fixing #5

[waihankan]

is aarch64 supported now?

[Shmayro]

is aarch64 supported now?

@waihankan This only allows running arm apps into x86
To support aarch64, we need to aarch64 android ROM instead of X86, they still not publicly available, i will rechallenge this

[directentis1]

Testing some apps that work well.
But there seems to be a bug somewhere, when installing xapk with AppManager or xapk, it leads to a reboot.