[Rust] Module-side query builder types

[Shubham8287]

Description of Changes

Implements a query builder for rust modules according to the spec.

Look at the tests in query_builder.rs.

TODO: Extend return type for views to include Query and update the #[table] macro to generate query builder bindings.

API and ABI breaking changes

This is an additive change. Current modules do not need to be updated unless they wish to use the query builder.

Expected complexity level and risk

1.5, Will appreciate comments to better structure code.

Testing

[x]: unit tests.

I have also done type safety checks manually from module.

[Shubham8287]

Changes since last review:

1. Added Timestamp, Bytes as literals.
2. Renamed Expr<T> to BoolExpr<T> and ValueExpr<T> to Operand<T>.
3. fix conflicting macro changes and using pair of struct identifier and table name to implement traits.
4. Some minor naming corrections as per suggestion.

[joshua-spacetime]

End to end tests will be added in a separate patch that updates the #[view] return type and generates the query builder bindings.