script: Migrate deriveBits/get key length operation to use new normalization (servo#39805)

Refactoring of the algorithm normalization in servo#39431 introduces a new
algorithm normalization procedure to replace the existing one, and we
continue the migration here. This patch is the last piece of this
migration.

In this patch:

- The `SubtleCrypto.deriveKey` and `SubtleCrypto.deriveBits` method are
migrated from using existing `normalize_algorithm_for_derive_bits`,
`normalize_algorithm_for_import_key` and
`normalize_algorithm_for_get_key_length` functions to using the new
`normalize_algorithm` function.
- The custom types `DeriveBitsAlgorithm`, `ImportKeyAlgorithm` and
`GetKeyLengthAlgorithm` used by `normalize_algorithm_for_derive_bits`,
`normalize_algorithm_for_import_key` and
`normalize_algorithm_for_get_key_length` are removed.
- The custom type `DigestAlgorithm` is also removed.
- The `SubtleHkdfParams::derive_bits` function is moved to sub-module
`hkdf_operation`.
- The `Subtlepkdf2Params::derive_bits` function is moved to sub-module
`pbkdf2_operation`.
- The `SubtleHmacImportParams::get_key_length` function is moved to
sub-module `hmac_operation`.
- The `get_key_length_for_aes` function is moved to sub-module
`aes_operation`.
- The `import_key_aes`, `import_key_hkdf`, `import_key_hmac` and
`import_key_pbkdf2` are removed since they are no longer in use.

Testing: Refactoring. Existing WPT tests suffice.
Fixes: Part of servo#39368

Signed-off-by: Kingsley Yung <[email protected]>

Author: kkoyung