bugfix: handle new rate-limits for querying pools

[akorchyn]

Closes: #431

• Added fast-near for testnet
• Rate limited querying pools to 140 / 30s

Ideally, if Fastnear is stable enough, the user shouldn't be able to hit this limit as we will query information within the pools the user has staked before.
But in case the fastener fails, we would need to query all active pools, which number more than 150.

Network	FastNear	Non fast near
Testnet	< 140 (mostly 0-5)	563 pools
Mainnet	< 140 ( mostly 0-5 )	State of contract poolv1.near is too large to be viewed

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Current status: executed

Reviewer	Score
@frolvanya	3
@dj8yfo	13

Your contribution is much appreciated with a final score of 8!
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[frolvanya]

@race-of-sloths score 3

[frolvanya]

LGTM

[dj8yfo]

@race-of-sloths score 13

[PolyProgrammist]

LGTM. I don't think there should be a separate ConfigV3 struct as it is the same as V2. Though it's ok