Rich theme for standardizing colors

[shahzebsiddiqui]

We need to declare theme in one place that can be reused throughout throughout code base without updating all the styles

See https://rich.readthedocs.io/en/latest/style.html#loading-themes.

Let's start to declare a theme and slowly migrate part of the codebase to use the themes.

There are several tables used for the following commands:

• buildtest build
• buildtest buildspec find
• buildtest buildspec invalid
• buildtest buildspec maintainers -l
• buildtest buildspec maintainers -b
• buildtest report
• buildtest report summary
• buildtest history list
• buildtest inspect list

For the time being let's start to work on refactoring code for commands for the following commands:

• buildtest history list,
• buildtest inspect list,
• buildtest buildspec maintainers -l
• buildtest buildspec maintainers -b