Increase CSI param limit to 256 to match Kitty #6194
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On the current WezTerm master, the maximum number of params a CSI sequence is allowed to have is 32, which is too low to successfully parse some perfectly valid CSI sequences as described here: #5161.
This PR increases this limit to 256 params, as this is what the Kitty terminal emulator uses.
One unfortunate side effect is that due to this change, the byte string in the csi_too_many_params test now needs to have 257 params in its CSI sequence, which makes the test rather unwieldy. I am open to suggestions on how to improve this situation.