fix: helix requires uppercase, and doesn't provide volume

[PFC-developer]

fix helix as a provider.

it retrieves price quotes, but volume is not available via the API call. (so I returned it as one).

pushing it up to see if people have better options for volume

[PFC-developer]

to test
add

[[currency_pairs]]
base="WUSDM"
quote="USDT"
providers = ["helix"]

[[currency_pairs]]
base="MOTHER"
quote="INJ"
providers = ["helix"]

[[currency_pairs]]
base="GME"
quote="INJ"
providers = ["helix"]

[[currency_pairs]]
base="PYUSD"
quote="USDT"
providers = ["helix"]

[[currency_pairs]]
base="USDY"
quote="USDT"
providers = ["helix"]

[[provider_endpoints]]
name = "helix"
url_set = "api_injective"

[helix]
token_file = "https://raw.githubusercontent.com/InjectiveLabs/injective-lists/master/tokens/mainnet.json"

[url_set.api_injective]
urls = [
  "your favorite API"
]

[PFC-developer]

code doesn't take into account different decimals. present in some markets. do not apply

[PFC-developer]

code now uses a external file (settable in config) to get the list of tokens, and their decimal size.
it skips tokens where price spread if > 10% (helix only)

[PFC-developer]

@starsquidnodes any chance for a review/merge?

[starsquidnodes]

helixTokenFile shouldn't be provided as dependency and use contract_addresses instead. This is more in line with the current way of configuration and allows for independent overrides.

Or alternatively be used inside the helix provider only and not be part of the config which needs extending the oracle class.