Add IsotropicChargeDriftModel and add more materials

[Padniuk]

This model was called as IsotropicMobilityChargeDriftModel because it uses identity-like mobility tensor:

$$v_{i}^{e,h}=\mu_{ij}^{e,h}\cdot E_{j}^{e,h} = \mu^{e,h}\cdot E_{i}^{e,h}$$

The semiconductor should have material properties μ_e and μ_h. Like in example:

    μ_e = 1000u"cm^2/V/s",
    μ_h = 1000u"cm^2/V/s"

The usage examples are the following:

    sim.detector = SolidStateDetector(sim.detector, IsotropicChargeDriftModel{T}(1, 1)) # defaul units are m^2/V/s
    sim.detector = SolidStateDetector(sim.detector, IsotropicChargeDriftModel{T}(100u"cm^2/V/s", 1400u"cm^2/V/s"))
    sim.detector = SolidStateDetector(sim.detector, IsotropicChargeDriftModel("<path_to_config_file>"))
    sim.detector = SolidStateDetector(sim.detector, IsotropicChargeDriftModel()) # use default config in examples/example_config_files/IsotropicChargeDriftModel/

Additionally two new materials were added: $CsPbBr_{3}$ and lead:

abstract type CsPbBr3 <: AbstractDriftMaterial end
Symbol(::Type{CsPbBr3}) = :CsPbBr3
material_properties[:CsPbBr3] = (
    name = "CsPbBr3",
    E_ionisation = 6.9u"eV",
    ϵ_r = 16.46,
    ρ = 4.73u"g*cm^-3"
)

material_properties[:Pb] = (
    name = "Lead",
    ϵ_r = 1,
    ρ = 11.35u"g*cm^-3"
)

[fhagemann]

This, in principle, looks good to me. I will have a detailed look st this later.
Could you maybe separate your first commit into two (one introducing the model, the other one adding new materials)?

[fhagemann]

Looks good to me.
I will spend some time to write tests for this, but afteerwards, this should be good to go.

[fhagemann]

Sorry for all this force pushing, but the tests I added should also be good to go now.
I would wait until the tests pass and then merge ASAP.

[fhagemann]

@Padniuk Thanks for the PR!

We will probably leave this on main for some time before releasing it for some test period. If you already want to use it now, you could load SolidStateDetectors using

]add SolidStateDetectors#main