Implement BFVServer ParametersForScalarU64 struct (like BfvClientParametersForScalarU64)

[Janmajayamall]

BFVServerParametersForScalarU64 will holds necessary precomputes to perform server side BFV functions. For example, (1) precomputes for Hybrid key switching for relinerization & rotations (2) Addition (3) subtraction (4) Multiplication

1. Implement BfvMultiplicationAlgorithm2Parameters, HybridKskRuntimeParameters traits.
2. Using the struct, add necessary tests for all server side BFV operations.
3. Tests can have small ring_size, since big ring_size will be expensive to run in debug mode (or in general)