Feat: integration layer with multitfa

[carrascomj]

Description

MultiTFA is a multivariate thermodynamics-based metabolic flux analysis package. It constrains the thermodynamic calculations more tightly by making use of the covariance matrix of formation energies instead of using independent squared standard deviations.

Since it uses equilibrator-api, it also benefits from the wide range of metabolites and databases that equilibrator provides, not being constrained to a thermo DB like pytfa.

Implementation

Two classes had to be inherited from multitfa to make them aware of proteins. The imports were removed from the init in integration to avoid having to install pytfa or multitfa at the same time.

• Blocked by [FEAT] allow metabolites to be ignored biosustain/multitfa#27
• Better document the code
• Test that metabolite identifiers are correctly queried from equilibrator.