Add color option to CLI flags for output styling

[catatsuy]

This pull request mainly introduces colorized output to the CLI in the cli/cli.go file. It adds a new boolean field color to the CLI struct, a new command-line flag -color to control the color output, and modifies the matchesFilters function to return the matched regular expression. It also updates the filterProcess function to colorize the output line if the -color flag is set or if the output is a terminal. Additionally, a new function colorText is introduced to colorize the matched text, and a new test case is added in cli/cli_test.go to verify the color output.

Here are the major changes:

• cli/cli.go:

  • Added a new boolean field color to the CLI struct to control the color output.
  • Added a new command-line flag -color in the parseFlags function.
  • Modified the filterProcess function to colorize the output line if the -color flag is set or if the output is a terminal.
  • Modified the matchesFilters function to return the matched regular expression.
  • Introduced a new function colorText to colorize the matched text.

• cli/cli_test.go:

  • Added a new test case in TestRun_successProcess to verify the color output.