feat: Add support for submitting general DAO proposals

[vsavchyn-dev]

This pull request closes #197, adding support for submitting transactions of type Action::FunctionCall and Action::Transfer as FunctionCall and Transfer DAO proposal kinds respectfully.

Therefore, by writing:

near \
  tokens devhub.sputnik-dao.near \
  send-near receiver.near 10N \
  network-config mainnet \
  submit-dao-proposal dao-member.near \
  'dao description' \
  prepaid-gas '100.0 Tgas' \
  attached-deposit 1N \
  sign-with-keychain \
  send

You can construct Transfer dao proposal:

signer_id:    dao-member.near
receiver_id:  devhub.sputnik-dao.near
actions:
       -- function call:      
                       method name:  add_proposal
                       args:         {
                                       "proposal": {
                                         "description": "dao description",
                                         "kind": {
                                           "Transfer": {
                                             "amount": "10000000000000000000000000",
                                             "msg": null,
                                             "receiver_id": "receiver.near",
                                             "token_id": ""
                                           }
                                         }
                                       }
                                     }
                       gas:          100.0 Tgas
                       deposit:      1 NEAR

Added things:

DAO Proposal Functionality:

• Added a new module submit_dao_proposal in src/transaction_signature_options/mod.rs to support converting transactions into DAO proposals. This includes defining the DaoProposal structure and its associated arguments, contexts, and signing options.
• Implemented ProposalKind enum in src/transaction_signature_options/submit_dao_proposal/dao_kind_arguments.rs to handle different types of DAO proposal arguments, such as Transfer and FunctionCall.

Argument Decoding:

• Added a deep_decode_args function in src/common.rs for print_unsigned_transaction function to recursively decode base64-encoded arguments in JSON objects. This ensures nested arguments are properly decoded, so person who submits things can see all sub-arguments in human-readable text, and not in base64.

Dependency Updates:

• Added new dependencies base64 and serde_with to Cargo.toml for handling base64 encoding/decoding and advanced serialization/deserialization (it was already included to other dependencies).

Utility Enhancements:

• Added a from_near method to the NearToken type in src/types/near_token.rs.

[frol]

@vsavchyn-dev Niiice! This looks really good and already works mostly fine. I would like to only ask to address the minor review requests and we are good to go!

[frol]

@race-of-sloths score 13

[race-of-sloths]

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Current status: executed

Reviewer	Score
@frol	13

Your contribution is much appreciated with a final score of 13!
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[vsavchyn-dev]

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