Solve models in parallel with multi processing #566

Job	Run time
Lint	41s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 47s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 57s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 44s
Tests (3.10, git+https://github.com/pastas/[email protected])	1m 55s
Tests (3.10, git+https://github.com/pastas/pastas.git@dev)	1m 45s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 52s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 40s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 47s
Tests (3.11, git+https://github.com/pastas/[email protected])	1m 37s
Tests (3.11, git+https://github.com/pastas/pastas.git@dev)	2m 55s
Tests (3.12, git+https://github.com/pastas/[email protected])	1m 34s
Tests (3.12, git+https://github.com/pastas/pastas.git@dev)	1m 35s
	22m 49s

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