Add --status-codes, --exclude-codes flag

[ksg97031]

Resolve: #397

Examples

Command 1:
$ crystal run src/noir.cr -- -b ../spring-demo -u http://172.30.1.15:8080 --status-codes

Command 2:
$ crystal run src/noir.cr -- -b ../spring-demo -u http://172.30.1.15:8080 --exclude-codes 400

Error Cases

Without URL option:
$ crystal run src/noir.cr -- -b ../spring-demo --status-codes
$ crystal run src/noir.cr -- -b ../spring-demo --exclude-codes

Invalid exclude codes:
$ crystal run src/noir.cr -- -b ../spring-demo -u http://172.30.1.15:8080 --exclude-codes aaa

Server doesn't respond:
$ crystal run src/noir.cr -- -b ../spring-demo -u http://127.0.0.1:8081 --status-codes

[ksg97031]

Code Color:

• 1xx: light_green
• 2xx: light_green
• 3xx: cyan (yellow is already used for endpoint URLs)
• 4xx: light_red
• 5xx: light_magenta