feat: improve `Assignment` API errors (#357) · privacy-scaling-explorations/halo2@4cf2a70

The following actions uses node12 which is deprecated and will be forced to run on node16: actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v3, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

unexpected `cfg` condition value: `floor-planner-v1-legacy-pdqsort`

unexpected `cfg` condition value: `floor-planner-v1-legacy-pdqsort`

public documentation for `create_proof` links to private item `ProverQuery`

`halo2_backend` (lib doc) generated 1 warning

unresolved link to `MockProver`

unresolved link to `WitnessCollection`

unresolved link to `keygen`

unresolved link to `NotEnoughRowsAvailable`

`halo2_frontend` (lib doc) generated 6 warnings (2 duplicates)

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