Bucket fill tool

[jacobschwantes]

Is your feature request related to a problem? Please describe.
Currently, filling large areas of the canvas with a single color is time-consuming and tedious. Users have to manually color in each pixel or use the brush tool repeatedly, which can result in uneven coloring and takes a lot of effort.

Describe the solution you'd like
Implement a Bucket Fill tool that allows users to fill connected areas of the canvas with a single click. When a user selects the Bucket Fill tool and clicks on a pixel, it should fill all adjacent pixels of the same or similar color with the selected color, stopping at boundaries of different colors or the edge of the canvas.

Additional context

• Need to implement an efficient flood fill algorithm client side
• Need to determine a data type/event and how we will store that in state