feat: add (optional) timeout config to prevent checkout crashes (error 504)

[ivanaugustobds]

Adds a new config to allow a timeout to be set (this prevents error 504 in checkout in case of api instabilities):

Some notes:

• this feature is disabled by default, so unless the storekeeper explicitly enables this it will not affect the current behavior at all;
• it relies on this enhancement on the php lib, and after the lib version update there this MUST BE reflected in the composer.json of this module (preview: https://github.com/FrenetGatewaydeFretes/frenet-magento2/pull/24/files#diff-d2ab9925cad7eac58e0ff4cc0d251a937ecf49e4b6bf57f8b95aab76648a9d34L12);
• also, Déjà vu!

[alexandercamps]

Bom dia @ivanaugustobd !
Uma ideia muito boa mesmo, garantir que o módulo se proteja de algum momento de timeout da API de cotação.

Vou realizar testes da sua melhoria na versão de produção do plugin.

Abs,