New version: FastIsostasy v0.2.0

[JuliaRegistrator]

• Registering package: FastIsostasy
• Repository: https://github.com/JanJereczek/FastIsostasy.jl
• Created by: @JanJereczek
• Version: v0.2.0
• Commit: 5224446b550b1acfb0c44763dd767e92c076b64e
• Reviewed by: @JanJereczek
• Reference: Register v0.2 JanJereczek/FastIsostasy.jl#84 (comment)
• Description: Accelerated computation of glacial isostatic adjustment for laterally-variable solid-Earth
• Release notes:

## Breaking change
- `SolverOptions` was introduced to specify options and replaces a number of keyword arguments normally provided directly to `FastIsoProblem`.
- Running interactive sea level requires a mask to prevent changes of the load column close to the boundary of the domain.
- To make sure that the elastic and geoid response are saved in the output for a step-wise forcing, one needs to provide an additional time step. For instance: `t = [-1e-8, 0, 50_000]` for a forcing that starts at zero and a simulation that ends at 50 kyr.
- Anything related to time-variable viscosity was removed, since we have no idea of the evolution of viscosity over time.

## Improvements
- Support of fully interactive sea level with absolute ice thickness, bathymetry... etc.
- Data loaders for most of the data required to run a simulation.
- Generic boundary conditions which minimise memory allocation on GPU and CPU.
- `InplaceConvolution` internally allows to reduce the memory allocation (which was critical for high-resolution runs).
- Type instabilities of `dudt_isostasy` were fixed, code is faster than ever!
- Piecewise linear approximation of ocean surface falls back to piecewise constant approximation if does not converge. Robust and sensible output (however impossible to benchmark so far...)

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