feat: osc 53 selection api

[raphamorim]

This is a proposal of terminal protocol

# Set selection from row 5, column 10 to row 8, column 45
printf '\033]53;s;5,10;8,45\033\\'

# Clear selection
printf '\033]53;c\033\\'

# Query current selection
printf '\033]53;q\033\\'

# Copy selection to clipboard
printf '\033]53;y\033\\'

# Select entire first line (columns 0-79)
printf '\033]53;s;0,0;0,79\033\\'

# Select a block from row 2, col 5 to row 10, col 30
printf '\033]53;s;2,5;10,30\033\\'