Transform kernels and convolutions using a transformer before code generation

[clinssen]

For a full discussion, see #1020.

Removes the "inline aliases convolution" concept. Convolutions or inlines can no longer be assigned to. For those cases, the onEvent handler blocks and an explicitly specified set of state variables need to be used.

TODO

• Fix issue with the units: need a full table of predefind units and multiplers for sympy parsing.
• Fix issue with the units: ODEs coming back from ODE-toolbox have mixed units/no units, such as x/tau**2 - x. Overall physical unit of the ODE rhs should be 1/s.
  • disable the check! Already in place via after_ast_rewrite in co_cos_manager.py.
• Pick an extreme lowest priority for the added event handlers and add the handlers with the right priority
• Fix CI
• Fix NEST-compartmental
• Update documentation

Fixes #1020.
Fixes #1013.
Fixes #993.
Fixes #1008.

[github-actions]

Bencher Report

Branch	1050/merge
Testbed	ubuntu-latest

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Benchmark	Latency	nanoseconds (ns)
tests/nest_continuous_benchmarking/test_nest_continuous_benchmarking.py::TestNESTContinuousBenchmarking::test_stdp_nn_synapse	📈 view plot ⚠️ NO THRESHOLD	4,428,440,483.20

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