WIP: Lachesis type refactoring (don't merge)

[b-scholz]

The Lachesis does not carefully differentiate between concepts (e.g., an event can be a hash, ID, or object) and uses package names to differentiate them. The concepts are defined in various directories. This attempts to place consensus objects into a single package called types (NB: I could not use types because of name conflicts with Ethereum in the Sonic client).

The necessary changes to the client are shown here:
https://github.com/Fantom-foundation/Sonic/compare/b-scholz/lachesis-type-refactoring?expand=1

[b-scholz]

The following symbols are used from the ltypes package:

ArrayToValidators
BaseEvent
BeginBlockFn
BlockCallbacks
BlockID
BytesToBlockID
BytesToEvent
BytesToHash
BytesToLamport
Cheaters
Consensus
ConsensusCallbacks
EpochID
Event
EventHash
EventHashes
EventID
FakeEvent
FakeEvents
FakeHash
FrameID
FromBytes
GetNodeName
Hash
HexToEventHash
HexToHash
Lamport
MaxLamport
Metric
MutableBaseEvent
NewBigBuilder
NewBuilder
Of
OrderedEventHashes
SetEventName
ValidatorID
ValidatorIdx
Validators
Weight
Zero
ZeroEvent