…ommitment key size hint

- Converted `CommitmentKeyHint<G>` from a boxed dynamic trait object to a direct dynamic trait object in `r1cs/mod.rs`.
- Changed the `commitment_key` function to always require a commitment key floor, eliminating the need for default behavior when a floor function isn't provided.
- Updated the `r1cs_shape` function across various files to take in a `CommitmentKeyHint` instead of it being optional and introduce a closure as an argument.
- Relevant modifications and updates were made in the `r1cs_shape` and `commitment_key` function calls within the test functions for various modules.
- Ported use of commitment key hint to Supernova, closing microsoft#53.
- This PR puts Arecibo in line with microsoft#203

…ommitment key size hint (microsoft#95)

* refactor: Refactor public parameters setup to remove optionality of commitment key size hint

- Converted `CommitmentKeyHint<G>` from a boxed dynamic trait object to a direct dynamic trait object in `r1cs/mod.rs`.
- Changed the `commitment_key` function to always require a commitment key floor, eliminating the need for default behavior when a floor function isn't provided.
- Updated the `r1cs_shape` function across various files to take in a `CommitmentKeyHint` instead of it being optional and introduce a closure as an argument.
- Relevant modifications and updates were made in the `r1cs_shape` and `commitment_key` function calls within the test functions for various modules.
- Ported use of commitment key hint to Supernova, closing microsoft#53.
- This PR puts Arecibo in line with microsoft#203

* doc: document Supernova Public Parameters

- Enhanced the `PublicParams` struct within `./src/supernova/mod.rs` with detailed comments

* feat: Refactor to use `default_commitment_key_hint` across codebase

- Introduced a new function `default_commitment_key_hint` in `nova_snark` package to provide a clearer default sizing hint for the commitment key,
- Replaced hard-coded zero values throughout the codebase with calls to `default_commitment_key_hint` function,