Add: new class FlowSolver

[AlbertoCuadra]

Description:
This issue proposes the addition of a new class, FlowSolver, designed to solve the governing equations of one-dimensional compressible flow in a duct. This class will initially implement functionality based on the work of Shapiro (1953) and aims to address various physical effects that influence flow in ducts.

Key Functionalities to Implement:

• Area Change: Support for variable area ducts to model nozzle and diffuser effects.
• Wall Friction: Include frictional effects along duct walls.
• External Heat Exchange: Allow for heat addition or removal through duct walls, simulating thermal interactions with the environment.
• Chemical Reaction: Enable combustion or other chemical reactions within the flow.
• Phase Change: Model phase transitions such as evaporation or condensation within the duct.
• Gas Mixing: Account for secondary gases injected into the main stream, influencing composition and properties.
• Variable Molecular Weight and Specific Heat: Adjust for changes in gas properties due to combustion, phase change, or gas injection.