Move AArch64 payload mixins under payload/windows/aarch64/

[vinicius-batistella]

Follow-up to rapid7#21744 addressing @dledda-r7's non-blocking note about the AArch64 mixin layout.

Summary

• Move exitfunk_aarch64.rb and reverse_tcp_aarch64.rb from lib/msf/core/payload/windows/ into lib/msf/core/payload/windows/aarch64/, mirroring the existing payload/windows/x64/ layout.
• Add lib/msf/core/payload/windows/aarch64 to Zeitwerk's collapse_list in lib/msf_autoload.rb so the module namespaces stay flat (Msf::Payload::Windows::Exitfunk_Aarch64, Msf::Payload::Windows::ReverseTcp_Aarch64), matching the x64 convention (BindTcp_x64, Exitfunk_x64, etc.).
• No code changes in the moved files. No include statements in payload modules needed updating.

The shared helper module (Msf::Payload::Windows::Aarch64, in windows/aarch64.rb) stays where it is - the sibling .rb file defines the parent namespace and the collapsed aarch64/ directory contributes the individual mixins under the same namespace.

Verification

./msfvenom --refresh-cache -l payloads | grep 'windows/aarch64' on this branch:

windows/aarch64/exec                Executes an arbitrary command on a Windows on ARM (AArch64) target...
windows/aarch64/shell/reverse_tcp   Spawn a piped command shell on Windows on ARM (AArch64) (staged)...
windows/aarch64/shell_reverse_tcp   Connect back to the attacker and spawn a Windows command shell...

Generation still produces identical shellcode sizes:

$ ./msfvenom -p windows/aarch64/shell_reverse_tcp LHOST=192.0.2.10 LPORT=4444 -f raw
Payload size: 664 bytes

$ ./msfvenom -p windows/aarch64/shell/reverse_tcp  LHOST=192.0.2.10 LPORT=4444 -f raw
Payload size: 716 bytes

• rubocop on the moved files and lib/msf_autoload.rb: no new offenses (two pre-existing Style/Documentation offenses on msf_autoload.rb are already present on rapid7/master).
• ruby tools/dev/msftidy.rb on the three consuming modules (singles/windows/aarch64/shell_reverse_tcp.rb, stagers/windows/aarch64/reverse_tcp.rb, stages/windows/aarch64/shell.rb): clean.

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