[Epic] [8] streamline network requests

[nikhilsaraf]

we are making too many network calls for basic information

See experimental profiling options added to binary in this commit (12ac3ce9d4d27acd57da0f9d6edeecdf671e1f4f)

• [ ] ieif makes multiple requests and has added a layer of complexity with caching, which can probably be removed once streamlined (moved to issue streamline networks requests made by ieif #650)

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Done in Sprint 5

• [3] low-hanging fruit improvements to networking code that doesn't need redesign (issue)
• [2] only reset cached balances and liabilities if pruneOps > 0, reducing unnecessary network calls (issue)
• [2] use single call to load offers when resetting liabilities (issue)
• [2] Faster network calls using fasthttp (issue)

[nikhilsaraf]

The bot prints out the time taken by the update function for everything except the submit operation.

Benchmarks:

• time for update() with all network requests: ~4.2s
• time for update() with all network requests turned off: 1-2 ms 🔥

This means we can drive a lot more performance from the bot.

See uploaded pprof files for the above.
profiler_no_network.data.gz
profiler_with_network.data.gz