Extend Sum rules & Compute Effective charge

[Radonirinaunimi]

Extend the sum rule module to easily include more rules such as Bjorken and GDH. The module also allows for the computation of the effective charge from the $\rm{unpolarized}$ sum rules referencing to the following computations:

• https://arxiv.org/pdf/2303.00723.pdf
• https://arxiv.org/pdf/1002.3948.pdf
• https://arxiv.org/pdf/1604.08082.pdf

and the following experimental measurements:

• https://arxiv.org/pdf/0803.4119.pdf
• https://arxiv.org/pdf/2205.01169.pdf
• https://arxiv.org/pdf/2205.01169.pdf