fix: withdraw/deposit converts from BZZ (10^16 base units) (#66)

* refactor: added toBZZbaseUnit function

* feat: added utility for attesting value is BZZ convertible to base units

* fix: conversion from 15 to 16 decimal places, added unsafe versions

* refactor: withdraw modal uses the safe conversion from BZZ

* refactor: added BigNumber and Token class to handle BZZ digits correctly

* refactor: extract deposit and withdraw functionality into single modal

* test: added tests for Token

* chore: removed unused component

* chore: addressed PR review, token decimal is now integer 0-18

* chore: added comment to clarify the value restriction on token amount

src/containers/DepositModal.tsx

@@ -0,0 +1,18 @@
+import type { ReactElement } from 'react'
+import { beeDebugApi } from '../services/bee'
+
+import WDModal from '../components/WDModal'
+import { BigNumber } from 'bignumber.js'
+
+export default function DepositModal(): ReactElement {
+  return (
+    <WDModal
+      successMessage="Successful deposit."
+      errorMessage="Error with depositing"
+      dialogMessage="Specify the amount of BZZ you would like to withdraw from your node."
+      label="Deposit"
+      min={new BigNumber(0)}
+      action={beeDebugApi.chequebook.deposit}
+    />
+  )
+}