Make "expiration time" to be configurable in BoxDeveloperEditionAPIConnection

### Is your feature request related to a problem? Please describe.

For people with a bad internet connection, 30 seconds might be not enough to acquire a token.
As a workaround, we can increase max attempts but maybe increasing the count of an expiration time for claims would be more efficient.

### Describe the solution you'd like

Frankly, I don't like BoxGlobalSettings with statics variables, but it might be the solution. (with the additional setter in BoxDeveloperEditionAPIConnection) the same thing as we have for maxRetryAttemps.

### Describe alternatives you've considered

Increase the max retry attempts and cross your fingers.

### Additional context