Add Search function for scrollback buffer and configure the buffers size

[MR-TLL]

Is your feature request related to a problem? Please describe.
Many times ,we want to search the scrollback buffer for a specific text. It would be awesome if a scrollbak search function can be implemented like in item2, where it not only highlights the search pharases but also allows you to navigate between the matched words. Similar to VSCODE find functionality.

Also configuring scrollbak buffers size is also important. Sometimes you want to keep output of large amount of text.

The terminal is very good, looks very modern and has quite a lot of features. It can lag a bit sometimes and performance and always be improved. but i'll open a different issue for this. Thanks for developing wives, and i hope you'll continue to improve it. cheers