improve (async) query map result

[thewhaleking]

1. ensures that self.records is updated when the (Async)QueryMapResult is iterated over. Previously only the initial set of records was ever available, so running:

qm = QueryMapResult(page_size=10)

for item in qm:
    pass  # let's say this iterates 100 times

# before
print(len(qm.records))  # would still just print 10, and it would be the initial records

# now
print(len(qm.records))  # would print 100

2. adds retrieve_all_records method to (Async)QueryMapResult — basically a convenience method that allows one to "fully exhaust" all pages and have them returned all at once. While await substrate.query_map(fully_exhaust=True) can achieve the same goal for AsyncSubstrateInterface, there's no good method like this for sync, and this doesn't cause a massive gathering, like what would happen in the case of fully_exhaust=True

3. Adds unit tests

[thewhaleking]

Test failures:
❌ An unknown error has occurred: Storage function "Swap.AlphaSqrtPrice" not found

This is unrelated to the PR, and is related to devnet-ready changing.