feat: Bulk payments

[tomijaga]

Resolves: #83

Implemented Bulk Payments.

I don't know if this is the best implementation.
I used the Transaction[] type instead of the TransferDetails class for the
methods createTransaction() and sendBulkTransactions()

Also Should i make the internal methods private

[zinoadidi]

i think internal methods can stay private;
this feature contains breaking changes so we (I) will need to make sure it's properly reflected for users.
we will need to add tests as well as update existing ones that should be broken now due to the change.

As I understand, all future transactions need to be in an array, single or multiple yes?

also, I created and linked an issue to it

[zinoadidi]

Need to add tests/update existing tests as well

[tomijaga]

@zinoadidi yh all transactions have to be in an array. Are u saying that I should remove the sendCoins() method. And instead, just have one method that can send single and multiple transactions

[zinoadidi]

@tomijaga i think it's fine to leave the sendCoin there.
but logically, it will be an obsolute means but makes sense to have something where user can show the correct intent what kind of transaction they are performing

[zinoadidi]

@tomijaga needs also tests then me can merge it and move to next one

[tomijaga]

@zinoadidi I'm currently doing school work rn but i will get the tests done at the end of the day. You can put up issues for the other changes and i will get to them as time permits me