feat: add riscv debugger support

[Jvlegod]

Checklist

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• This PR only contains minor fixes.
• This PR contains major feature update.
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Feature

88ca4d4 add the RISC-V related debugger components.

Fix

When I try to run tests for riscv, for example, using rootfs/riscv<32/64>_linux's example, I find that executing the si command causes it to jump straight to the end.

1f5801e fixes GDB breakpoint reliability by flushing TB after debugger hook and breakpoint updates. Without this, emulation may continue through cached TBs that were translated before the GDB code hook or breakpoint changes were visible.

References

• https://gnu.googlesource.com/binutils-gdb/+/refs/tags/gdb-17.2-release/gdb/features/riscv/

[retrocpugeek]

Looks good to me.
Tested single-stepping and breakpoints using gdb-multiarch with
riscv64_linux/bin/hello
riscv64_linux/bin/hello-linux
riscv32_linux/bin/hello
riscv32_linux/bin/hello-linux