next: meta-issue related to all toolchain caching erros in `gt4py.next`

[egparedes]

The current design and implementation of the cache for gt4py.next toolchain steps is broken in several ways. This issue tracks issues dealing with these problems and PRs trying to address them. Please reference this issue in all the TODOs you write in the codebase, e.g.# FIXME[#2447](<github_name>): ....

Issues.

• Cache build system config [declarative, OTF, caching]  #985
• next: GTFN Caching bug #1739
• next: gt4py stencil cache concurrency error during pytest -n #1765

PRs:

• fix[next]: fix for missing state info in the toolchain cache computations #2104
• don't merge: workaround caching issue #2425