refactor(hlapi): remove wrapping of booleans

This commit removes the wrapping of the `tfhe::boolean`
that was done in the HLAPI, effectively making the HLAPI
only wrapping `tfhe::integer`.

FheBool is now reused to be a single shortint block
compatible with other type FheUint8,16,etc (previously they were not).

In the future, `tfhe::boolean` could be re-wrapped in hlapi, but
this time, to be used as a base for all integers and not just
FheBool.

BREAKING CHANGE:
- hlapi no longer wraps tfhe::boolean API.
- tfhe::ConfigBuilder::enable_bool/disable_bool/all_disabled/all_enabled
  removed. Now default configuration should be done using
  `tfhe::ConfigBuilder::default()`.
- `tfhe::ConfigBuilder::use_default_small_integer` removed
  use `tfhe::CondifBuilder::default_with_small_encryption()`
- Uninitialied{ClientKey, PublicKey, CompressedPublicKey} error types
  removed as these erros are no longer possible

README.md

@@ -70,9 +70,7 @@ use tfhe::{generate_keys, set_server_key, ConfigBuilder, FheUint32, FheUint8};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     // Basic configuration to use homomorphic integers
-    let config = ConfigBuilder::all_disabled()
-        .enable_default_integers()
-        .build();
+    let config = ConfigBuilder::default().build();
 
     // Key generation
     let (client_key, server_keys) = generate_keys(config);