Support inject sharding algorithm objects by spring namespace

[terrymanu]

1. refactor algorithm-class to algorithm-ref of complex-strategy
2. refactor algorithm-class to algorithm-ref of hint-strategy
3. refactor precise-algorithm-class to precise-algorithm-ref of standard-strategy
4. refactor range-algorithm-class to range-algorithm-ref of standard-strategy

[terrymanu]

fixed at 3.0.0.M1