Feat: Add support for deleting a word in normal mode with de, db

[nickhealthy]

Description

Added support for the d command in normal mode to delete words using de, and db. This enhances text editing capabilities, aligning with typical Vim behavior for word deletion.

Changes

• Implemented the following key combinations in editing_normal_mode.rs:
  • de: Delete the word from the cursor to the end of the current word.
  • db: Delete the word before the cursor.
• update key mapping in vim_keymap.rs
  • NormalDelete

Why

• Improves text editing functionality by fully supporting common Vim-style word deletion commands.
• Enhances user experience with intuitive and familiar keybindings.
• Brings parity with Vim's powerful and efficient text manipulation features.

Testing

Verified that:

• Pressing de deletes from the cursor to the end of the current word.
• Pressing db deletes the word before the cursor.
• The implementation adheres to the normal mode behavior and does not interfere with other commands.

[panarch]

Looks all nice! Thanks a lot for the contribution 👍 👍