Implement Float Calculations

[pisum-sativum]

Description

Resolves #4

This PR introduces the float calculation module required for non-critical activities. Based on the calculated Early Start (ES), Early Finish (EF), Late Start (LS), and Late Finish (LF), the module can now calculate:

• Total Float (TF)
• Free Float (FF)
• Independent Float (IF)

Changes Made:

• Added total_float, free_float, and independent_float attributes to the Node class.
• Implemented calculate_floats() in CriticalPathMethod which processes the network logic according to standard CPM/PERT formulas.
• Added get_non_critical_floats() in CriticalPathMethod to cleanly extract and return these float metrics exclusively for non-critical activities.
• Maintained the existing library logic without introducing unnecessary changes or dependencies.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pisum-sativum]

@kathan-majithia I have done the necessary changes kindly check and merge and also add the gssoc and gssoc:approved tags.

[kathan-majithia]

Great @pisum-sativum , also add the display float in the network_summary function.

[pisum-sativum]

Great @pisum-sativum , also add the display float in the network_summary function.

@kathan-majithia I have done the necessary changes kindly check and merge with gssoc and gssoc:approved tags pls.

[kathan-majithia]

Display all types of float properly, for each node as well as final values.

[pisum-sativum]

Display all types of float properly, for each node as well as final values.

@kathan-majithia I have done the required changes pls check and merge with gssoc and gssoc:approved tags.