Implementation of the commondata filters

[Radonirinaunimi]

This PR implements the parsing of the HepData files into a format that we can easily use for the fit. Currently, the tables are saved directly as Pandas objects. The three categories of files (kinematics, data values, and uncertainties) have their own folders. The status (with some kinematic information) is summarized in the table below:

Datasets	$[x{\text{min}},~x{\text{max}}]$	$Q^2_{\text{min}}$	Measured Obs.	Done	Checked	Target
BEBCWA59	[0.028, 0.649]	0.160	$F_2, xF_3$	✅	✅	$N_e$
CCFR	[0.015, 0.650]	1.260	$F_2, xF_3$	✅	✅	$F_e$
CHARM	[0.015, 0.800]	0.180	$F_2, xF_3, \bar{Q} $	✅	✅	$CaCO_3$
NUTEV	[0.015, 0.750]	0.190	$F_2, xF_3, d^2 \sigma/(dxdy)$	✅	✅	$F_e$
CHORUS	[0.020, 0.650]	0.325	$F_2, xF_3, \sigma_L / \sigma_T, d^2 \sigma/(dxdy)$	✅	✅	$Pb$
CDHS			$F_2, d^2 \sigma/(dxdy)$	✅	✅	$D$, $F_e$
CDHSW	[0.015, 0.650]	0.190	$F_1, F_2, xF_3, d^2 \sigma/(dxdy)$	✅	✅	$F_e$

[giacomomagni]

Not yet implemented, to be done in later stage:

• [x] CDHSW tables 30-40 F_W, A
• [x] CHARM table 2, Qbar
• [x] CDHS all tables