Enhanced installation adding configurable database conncetion prompts

[yourchocomate]

Problem: Fresh installation of laravel using any database driver rather than sqlite starts with an error of can't connect with database. (more information ar #324)

Description:
This PR is supposed to make laravel installation smoother and more user-friendly by removing unnecessary migration prompt when database connection is not specified for drivers rather than mysql.

**Here's a video comparing current installer and patched installer experience **

• windows

0318.mp4

• Linux

laravel-installer-linux.mp4

Also,
The migration prompt won't appear when database connection is not specified.

Changes Made:

• Added new promptForDatabaseConfig function to specify the database connection.
• The prompt is made compatible with command option such as --database=pgsql
• promptForDatabaseOptions now returns three array values including configuration array
• Moved Default connection information array from commentDatabaseConfigurationForSqlite to configureDefaultDatabaseConnection

Any feedback & suggestions will be appreciated. Thank You.

[yourchocomate]

@taylorotwell
Any feedback would be appreciated for future approach.