Check optional sections in TOML file

[vers-w]

Optional TOML sections: time and logging.

[visr]

Ah I guess this will fix the build on TeamCity:

  [ Info: Simulation duration: 40 seconds, 577 milliseconds
05:17:35   ┌ Info: Write output states to netCDF file
05:17:35   └ /opt/teamcityagent/work/46377fba7f56e004/test/data/output/outstates-moselle.nc.
05:17:38   ERROR: LoadError: KeyError: key "logging" not found
05:17:38   Stacktrace:
05:17:38    [1] getindex
05:17:38      @ ./dict.jl:477 [inlined]
05:17:38    [2] getproperty(config::Wflow.Config, f::Symbol)
05:17:38      @ Wflow /opt/teamcityagent/work/46377fba7f56e004/src/io.jl:51
05:17:38    [3] run(tomlpath::String; silent::Nothing)
05:17:38      @ Wflow /opt/teamcityagent/work/46377fba7f56e004/src/Wflow.jl:218
05:17:38    [4] run(tomlpath::String)
05:17:38      @ Wflow /opt/teamcityagent/work/46377fba7f56e004/src/Wflow.jl:214
05:17:38    [5] top-level scope
05:17:38      @ /opt/teamcityagent/work/46377fba7f56e004/build/create_binaries/precompile.jl:10
05:17:38   in expression starting at /opt/teamcityagent/work/46377fba7f56e004/build/create_binaries/precompile.jl:10

[JoostBuitink]

As briefly discussed yesterday, perhaps (if possible) it is nicer to fix this in the Config function, such that the following approach would also work

using Wflow
config = Wflow.Config(toml_fn)
Wflow.run(config)