Work in progress.

- Implemented host function (not tested);
- Finalizer set types;
- Placeholders for fc::crypto::blslib::bls_public_key operators == != and <;
- Stub notify_set_finalizers signal to be connected to chain_plugin, to reach chain_pacemaker

- Storing set_finalizer data at controller
- chain_pacemaker retrievies set_finalizer data on get_finalizers() (not using it and not thread-safe yet)
- Fix legacy span
- Fix remove signal stub
- Fix finalizer name to string description
- Fix missing finalizer_set intrinsic whitelist upon feature activation

- Working ==, != and < operators in bls_public_key to enable testing this branch

Co-authored-by: Gregory Popovitch <[email protected]>

Co-authored-by: Gregory Popovitch <[email protected]>

- Tie up get_finalizer return value changes
- Better operator< for bls_public_key

Co-authored-by: Gregory Popovitch <[email protected]>

Co-authored-by: Gregory Popovitch <[email protected]>

- Fix breaking libtester w/ finalizer set fwd decl
- Remove finalizer_authority::get_abi_variant
- Fix init fthreshold in controller
- Add const to controller get_finalizer_impl()

IF: Add thread safety to chain_pacemaker access of chain state

…uff_1511_hostfn

…uff_1511_hostfn