HIP-904 System Contracts Implementation

[stoyanov-st]

Implement the Token Airdrop System Contract flows described in #15435

Tasks

Preview Give feedback

1. HIP-904: Token Airdrop System Contract #15588
   Hedera Smart Contract Service Token Airdrop +2
   
2. HIP-904: Token Cancel Airdrop System Contract #15589
   Hedera Smart Contract Service Token Airdrop +2
   
3. HIP-904: Token Claim Airdrop System Contract #15590
   Hedera Smart Contract Service Token Airdrop +2
   
4. HIP-904: Token Reject System Contract #15591
   Hedera Smart Contract Service Token Airdrop +2
   
5. HIP-904: SetUnlimitedAutoAssosiations System Contract #15592
   Hedera Smart Contract Service Token Airdrop +2
   
6. HIP-904: Update HIP documentation #15593
   +0
   
7. HIP-904: Add function definitions and tests to hedera-smart-contracts repo #15594
   +0
8. HIP-904: Additional e2e tests scenarios #15596
   22 of 58
   Epic +1
   

[Nana-EC]

Product team EPIC is here - hashgraph/hedera-smart-contracts#1012

[Nana-EC]

Product code done with the exception of authorized contracts and tests.
@stoyanov-st please create an EPIC if we don't have one for the backlog that will capture the work to allow contract A listed as an admin key on another entity to issue the HIP 904 calls on their behalf e.g. airdropTokens(address account, TokenTransferList[] memory tokenTransfers)

[Nana-EC]

Let's close this off in 0.59.0 B