Add support for near drops to CLI

[ilblackdragon]

There are two things:

• Creation of near drop

 $ near create-drop --amount <amount> --accountId <originating account> --escrow near
 Outputs [https://wallet.near.org/](https://wallet.near.org/)...

where --escrow defaults to near.

• Claiming near drop:

 $ near claim-drop <account-id> <public-key> <link>

Alternatively, link can be added as an option to create-account. On the other hand, one can claim it into existing account, so claim-drop can support that, which would make public-key optional if account already exists.

[Rishabhraghwendra18]

Hi . First timer here . May I work on this issue ?