Impl synthetix queries

[dbeal-eth]

this PR implements 3 major refactoring steps:

• usage of @synthetixio/wei
• usage of @synthetixio/queries
• update of CurrencyKey to be limited set of strings, which exposes case where we attempt to pass a CurrencyKey that is not actually a synth (surprisingly common bug that requires discussion)

Please read these notes before reviewing:

• Everywhere where you see currencyKey as CurrencyKey added is actually an existing bug in Kwenta where we are passing a non-synth to something that should only work with Synths (ex. a query which connect to the Synthetix subgraph or Synthetix contract). This is of course not good behavior so I left it in for right now and later we can make fine-grained fixes as we go.
• CurrencyKey is currently statically defined in the contracts-interface, but in the future we would like for this value to be derived dynamically from synthetix. This is in progress and should be impl soon.
• the useSynthetixQueries pattern is designed to maximize code reusability for many networks and providers.

What has already been tested:

• compiling, building, linting, etc.
• broad UI usability, performance, and functionality
• ensuring generated txns are at least valid

What needs to be tested:

• ensure transaction execution is successful and returns appropriate values
• ensure there is no regression of recent changes (since there were a lot of merges)
• deep testing of fine UI elements

/hours 15 july

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[dbeal-eth]

@JChiaramonte7 fixed the CI, testing environment deployed

for some reason the website is functioning much slower than in local dev environment. I think I have an idea what the problem is, but for now you should be able to test the functionality.

[jcmonte]

@KillerByte Thank you sir. I'll take a look again today.

[dbeal-eth]

communicated with @clementbalestrat and determined we should merge this into dev so that other feature branches can start using it.