Import Airdrop recipients via DnD or copy-paste

[mudrila]

Changes

• Fix crash when trying to open Airdrop template or Send Assets template on the DAO that doesn't have any ERC-20 in it's treasury
• Add DnD input field for importing recipients from CSV
• Add functionality to handle copy-pasting recipients into address field

Testing

Safe has no any ERC-20 tokens

1. Open Safe's Proposal Templates page
2. Try clicking Airdrop template -> make sure error text is present, saying that there're no assets
3. Try clicking Send Assets template -> make sure error text is present, saying that there're no assets

Safe has ERC-20 tokens

1. Open Safe's Proposal Templates page
2. Try importing recipients from correctly formatted CSV file -> make sure it added proper recipients with corresponding addresses and amounts
3. Try copy-pasting CSV content into address input -> make sure it properly adjusted recipients
4. Try importing / copy-pasting badly formatted CSV file -> make sure it doesn't change recipients and error toast shows up
5. Try creating proposal for the airdrop after importing recipients from properly formatted CSV -> make sure during proposal creation it displays proper "Airdrop action" and executing proposal disperses right amount of tokens to the proper recipients addresses

Screenshots

@nicolaus-sherrill @parkermccurley Given there's no rush - would be nice to get some UI / UX / Copy comments to polish this thing

[parkermccurley]

Hey @mudrila this looks great.

Add a ":" after "Available Balance" so it is "Available Balance:"
"Drag & drop a .csv file here, or click to select one"
"address,amount one entry per row"
When the number of recipients is 1, it should say "recipient" not "recipients"

Please factor these items in before merging. Feel free to ping me on Slack if you need anything so I can respond quickly.

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[parkermccurley]

Thanks @mudrila lfg