feat(cli): add methods to print to console

[czar0]

• Columnize() uses the text/tabwriter standard library to print fields that are vertically aligned in columns and split by the | delimiter character.
• GetValueByJSONTag() recursively searches for a string key within the JSON tags of a given object to return the value associated with it. This method uses command flags like --field where a single return value is expected.
• The format for the printing - minwidth, tabwidth, padding, padchar - is configurable.
• FromStruct() converts a struct into a Printable using, when available, JSON field names as keys.
• customFormat() is a utility function to format numbers to avoid scientific notation and ensure they are printed as integers.

(A/N: This PR will make much more sense once I push the implementation for the block command 😄. Coming soon! 😎)

Output example for the complex struct (in tests):

name                | complex
list                |
                    | first
                    | second
nested              |
                    | value              | 500000000
                    | title              | hello
object              |
                    | obj1               | 1
                    | obj2               | -2
objList             |
                    | item2              | 2
                    | item1              | 1
                    |                    |
                    | item3              | 30000000
                    | item4              | 20000000
                    | item5              | 21234560
                    |                    |