arm64singlestepper (dotnet/coreclr#25512)

arm64singlestepper (dotnet/coreclr#25512)

Add single step emulation for arm64 Linux

Add a copy and rework armsinglestepper to arm64singlestepper

Add arm64 emulation of all armv8 user space instructions which read or write PC.
- ADR, ADRP
- Branch instructions: B, BL, B.cond, BR, BLR, RET
- LDR (literal)

* Add FEATURE_EMULATE_SINGLESTEP
* Enable for ARM64 linux

* Debugging fixes

Fix IsSSFlagEnabled bug
Fix opcode type
Fix code buffer asserts
Fix CBZ typo
Fix BitExtract
Fix m_targetPc
Minimize written instructions
Fix comments
Fix Bypass address truncation
Fix false assert
Add additional logging
Use %lx to log addresses
Remove stray LOG
Remove stray assert

Commit migrated from https://github.com/dotnet/coreclr/commit/613f9f233abde4159a85aa8130b7fcb57dc7a4ef