Add copy command for clipboard integration

[zonuexe]

This PR introduces a new copy command to PsySH, allowing users to copy the inspected value of an expression or the last evaluated result ($_) directly to the system clipboard. This feature is inspired by the clipboard integration recently implemented in Ruby's IRB (ruby/irb#1044).

To ensure a seamless experience across various environments, the command automatically detects and utilizes available clipboard backends, including:

• pbcopy (macOS)
• wl-copy (Wayland / WSLg)
• xclip / xsel (X11)
• clip.exe (Windows / WSL)

Furthermore, I have implemented support for the OSC 52 escape sequence to facilitate remote development over SSH. This allows PsySH to bridge the remote server's output to the local machine's clipboard. OSC 52 is increasingly adopted by modern terminal emulators, including Windows Terminal and Ghostty, both of which prioritize security while enabling this functionality.

Since OSC 52 enables a remote process to write to the local terminal, this functionality is strictly opt-in via the new useOsc52Clipboard configuration. This approach mirrors the security-conscious defaults of terminals like Ghostty, where clipboard access must be explicitly allowed. When the command is used in an SSH environment without this setting enabled, PsySH will display a helpful "Productivity Tip" on how to enable it, along with a clear security warning regarding the risks of clipboard hijacking.

[codecov]

Codecov Report

❌ Patch coverage is 19.10112% with 72 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.06%. Comparing base (6bd1bfd) to head (5199b2f).

Files with missing lines	Patch %	Lines
src/Clipboard/ClipboardFactory.php	0.00%	19 Missing ⚠️
src/Clipboard/NullClipboardMethod.php	0.00%	17 Missing ⚠️
src/Command/CopyCommand.php	48.27%	15 Missing ⚠️
src/Clipboard/CommandClipboardMethod.php	0.00%	10 Missing ⚠️
src/Clipboard/Osc52ClipboardMethod.php	0.00%	7 Missing ⚠️
src/Configuration.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #910      +/-   ##
============================================
- Coverage     70.63%   70.06%   -0.57%     
- Complexity     3363     3394      +31     
============================================
  Files           157      162       +5     
  Lines          7966     8055      +89     
============================================
+ Hits           5627     5644      +17     
- Misses         2339     2411      +72     

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