[✨ Feature request]: Add a strain/stress calculator for rectangular reinforced cross-sections (RRCS)

[egarciamendez]

Description

Implement an object that has the responsability of making stress/strain calculations for RRCS.

Acceptance Criteria

• concrete stress/strain results on a random place inside the cross-section
• Stress/strain results for each bar inside cross-section.
• Calculations should happen by injecting a 'calculator' into the main class. This to make sure that different calculation methods can be used.

Nice to have:

• Stress/strain visualization of the RRCS

Dependencies

No response

Confirmation

• I have checked that this feature does not already exist in the issue tracker.
• I have read and understood the contribution guidelines.