Split calc_forces! out of solve! and make it zero-alloc #1282

Job	Run time
Julia 1.12 - ubuntu-latest - x64 - pull_request	23m 15s
Julia 1.12 - ubuntu-latest - x64 - with code coverage	12m 20s
Julia 1.11 - ubuntu-latest - x64 - pull_request	22m 26s
Julia 1.12 - windows-latest - x64 - pull_request	28m 39s
Documentation	2m 38s
Julia 1.11 - ubuntu-latest - x64 - with code coverage	15m 49s
Julia 1.12 - macOS-latest - aarch64 - pull_request	20m 8s
	2h 5m 15s

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