[Bundle] Enhance the change unit for easier comparison

[Adal3n3]

Problem

It's not very easy to understand the change of bundle size because the units on the UI are not the same as the "Previous size" and "New size".

Example 1:
Previous size: 6.87 MB
New size 6.87 MB
Change -575 B
6.87 MB - 0.000575 MB = 6.869425 MB

Example 2:
Previous size 27.99 MB
New size: 27.97 MB
Change: -19.27 kB (0.01927)
27.99 MB -0.01927 MB = 27.97073 MB
Example: link

Another example

Proposed solution

• We use the same unit when it comes to comparison (I know the number will not look pretty but I can understand the size,
• We can use % of change to help the user understand the size of change.