Added a clear button with the shortcut Command + K to clear the terminal

[Cyanosite]

Description

Added a new button at the bottom of the DebugAreaTerminalView for clearing the terminal, with the clear icon. The terminal can also be cleared with the command + K keyboard shortcut. The button also has a tooltip indicating that it is used for clearing the terminal

Related Issues

Closes #891 Closes #1143

• [x] I read and understood the contributing guide as well as the code of conduct
• [x] The issues this PR addresses are related to each other
• [x] My changes generate no new warnings
• [x] My code builds and runs on my machine
• [x] My changes are all related to the related issue above
• [x] I documented my code

Screenshots

https://github.com/CodeEditApp/CodeEdit/assets/38476845/27ab4e4b-70ea-4a9e-872e-7ad5d4721c28