REF: Revise SOCX boundary voltage constraints

[juanjospina]

The major motivation(s) behind this PR is:

1. Revise the SOCX boundary voltage constraints with new linear derivations.
2. Add calc_transmission_branch_flow_ac function that allows the computation of branch power flows for transmission systems when solving PFITD.

Code Changes

• Added new function calc_transmission_branch_flow_ac to data.jl that computes the branch power flows for transmission system when solving PFITD.
• Refactored SOCBF-SOCNLUBF voltage and angle boundary constraints.
• Refactored SOCBFConic-SOCUBFConic voltage and angle boundary constraints.
• Refactored SOCWRConic-SOCConicUBF voltage and angle boundary constraints.
• Refactored SDPWRM-SOCConicUBF voltage and angle boundary constraints.

[codecov]

Codecov Report

Merging #10 (ead8e6a) into main (cb5767d) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   81.13%   81.24%   +0.11%     
==========================================
  Files          28       28              
  Lines        3975     3999      +24     
==========================================
+ Hits         3225     3249      +24     
  Misses        750      750              

Impacted Files	Coverage Δ
src/core/data.jl	92.30% <100.00%> (+0.64%)	⬆️
src/form/wmodels.jl	96.39% <100.00%> (+0.79%)	⬆️

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