Lightsim2grid

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- [FIXED] a bug in the `init` function that caused issue when importing a grid with multiple slack
on some cases
- [FIXED] some bugs in the "SecurityAnalysis" and "TimeSerie" modules especially in DC mode.
- [FIXED] a bug in the DC comptuation: some "divergence" were not catched
- [FIXED] a bug in the "Computer" (cpp) class where the intial voltage could lead to generator not
participating correctly to the voltage regulation (wrong output voltage level).
- [FIXED] a bug in the "set_bus" of shunt (wrong bus was assigned cpp side)
- [FIXED] an issue when slack bus is added from ext grid (wrong active power value - sign issue)
- [ADDED] support for the CKTSO linear solver (on linux), which is slightly faster than SparseLU, KLU and NICSLU
(this requires a compilation from source)
- [ADDED] support for distributed slack bus in `LightSimBackend`
- [ADDED] support for "generator with p=0. do not participate in voltage regulation" in `LightSimBackend`
- [ADDED] support for the DC computation for "SecurityAnalysis" and "TimeSerie" modules
- [ADDED] support for DC powerline (in lightsim, they are still not handled in grid2op)
- [IMPROVED] now that multiple slacks is fully supported, the warnings when importing a grid with multiple slacks
are irrelevant. They have been removed.
- [IMPROVED] the documentation on the "sovlers" part
- [IMPROVED] move the "how to compile" section of the readme in the documentation
- [IMPROVED] `SuiteSparse` is upgraded to version 5.13 (issue with build system based on cmake and BLAS for SuiteSparse >= 6.0)
- [IMPROVED] upgrade to eigen `3.4.0` (stable release)

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- [BREAKING] drop support for numpy version < 1.20 (to be consistent with grid2op)
- [FIXED] a compatibility issue with grid2op 1.7.2 (missing another backend attribute
when the environment is copied) see https://github.com/rte-france/Grid2Op/issues/360
- [FIXED] now an error if thrown if the bus indexes in the pandapower grid are not contiguous
or do not start at 0 (thanks Roman Bolgaryn for spotting this issue)
- [ADDED] automatic build for python 3.11
- [ADDED] support for numpy >= 1.24 (some deprecation *eg** np.str and np.bool are removed)

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- [FIXED] a compatibility issue with grid2op 1.7.1 (missing a backend attribute
when environment is copied)

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- [ADDED] improved time measurments
- [ADDED] Possibility to set, at creation time, the type of solver used, number
of iterations and precisions with
`LightSimBackend(max_iter=..., tol=..., solver_type=...)`
- [IMPROVED] scripts to load the pandapower grid (json format)
- [IMPROVED] update the automatic tests on more recent compilers.

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- [FIXED] add support for python 3.10 now that scipy does (and add proper tests in CI)

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- [FIXED] support for python3.7 (and add proper tests in CI)