Michiel/add Akash validators (#540)

* first steps

* Integrate validators feature for akashv0

* Simplify extending Cosmos logic

* Remove unused imports

* Uncomment networks

* Commnet livepeer mainnet network

* fix validators expected returns

* apply code review

* Fix version transactionsByHeight

Co-authored-by: michielmulders <[email protected]>

lib/source/akashV0-source.js

@@ -23,7 +23,7 @@ class AkashV0API extends TerraV3API {
     if (blockHeight) {
       const response = await Promise.all([
         this.getRetry(`blocks/${blockHeight}`),
-        this.getTransactionsByHeight(blockHeight)
+        this.getTransactionsV2ByHeight(blockHeight)
       ])
       block = response[0]
       transactions = response[1]