Add empty check and chains endpoint

[akan72]

Summary

New /chains Endpoint

Adding another method to the Defillama class to consume the output from the /chains API endpoint.

This will allow us to programmatically get the TVL and/or names of all protocols for a specific chain.

Sorting the results to ensure that they're returned consistently between runs.

Empty Check for get_chain_tvl_timeseries

When grabbing data from get_chain_tvl_timeseries() for certain chains, the global TVL data can come back empty (ran into this for OntologyEVM)

To fix this, check to see if the global TVL results are empty and return an empty pd.DataFrame before assigning column names.

Tests

New endpoint

Results before the check

Results after the check is added

get_chain_tvl_timeseries() works for all chains returned when calling the /chains endpoint on Defillama

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