Revisit `target remote`

[hugsy]

A lot has changed since first introducing gef-remote to mitigate the many limitations of target remote. In addition this command has created countless issues/PRs because users were using target remote (when they should've used gef-remote).

Since the upgrade to a baseline of GDB 10 + Python 3.10, we can revisit target remote and probably (finally) deprecate gef-remote, mostly through pre and post hooks.

Steps

• Implement pre/post hooks on target remote #1150
  • Deprecate gef-remote
  • Pass existing tests
  • Add new ones (for syntax support)
  • Update docs
• Validate pwntools compat

Known related issues:

• Add support for registers in target remote post hook #1131
• Possible GEF dereference issue with gef-remote  #1080