Add support for dependency scopes

[tlaanemaa]

To enable more complex dependency injection schemes, we need to start supporting dependency scopes.

Constraints:

• We should support the following scopes

  • Transient
  • Singleton
  • Request

• The scope declaration API should look like this

container.bind<IMyComponent>(MY_COMPONENT, myComponent, { scope: 'transient' }

• Default scope should be transient

• All scopes should be exported from the package as a read only collection

import { scope } from 'tinioc'

container.bind<IMyComponent>(MY_COMPONENT, myComponent, { scope: scope.TRANSIENT }

[tlaanemaa]

I've started the implementation in the scope_support branch