[ENGA3-808] : Allow hosts config

[ajzkk]

Objective

Allow hosts config and added missing source retrieve function

#ENGA3-808

Description

• Allow hosts config to switch staging url.

import Omise from "omise";

const config = {
    host: "api.xxxxxxx.co",
    vaultHost : "vault.xxxxxxx.co",
    publicKey:    "pkey_*****************",
    secretKey:    "skey_*****************",
    omiseVersion: "2019-05-29",
};
  
const omise = Omise(config)

• Check response is valid json and reject promise if not valid.
• Add types to support hosts
• Added missing source retrieve function omise.sources.retrieve('src_xxxxxx')

[sonarcloud]

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