[2.0.x] [NFR] Added method generate random text

[KorsaR-ZN]

Generates random text in accordance with the template:

echo Phalcon\Text::dynamic("{Hi|Hello}, my name is a {Bob|Mark|Jon}!"); 
    // Hi my name is a Bob

echo Phalcon\Text::dynamic("{Hi|Hello}, my name is a {Bob|Mark|Jon}!");
    // Hi my name is a Jon

echo Phalcon\Text::dynamic("{Hi|Hello}, my name is a {Bob|Mark|Jon}!");
   // Hello my name is a Bob

[sergeyklay]

Can you please add small test?

[andresgutierrez]

Could you please rebase?

[KorsaR-ZN]

@andresgutierrez rebased

[andresgutierrez]

Thanks