Set up an oracle account on deployment of a network

[yerdua]

Description

This PR does the setup for an oracle account on a testnet. It adds a new type of account that has its address and private key generated from the mnemonic. This account is included as an oracle for StableToken in the migration overrides that are set when deploying with celotool. By being included in that set, it is whitelisted as an oracle, and funded in the genesis block to cover transaction fees.

Tested

I deployed a testnet with these changes, and verified that I was able to report values from that oracle account successfully.

Related issues

• Part of CLabs SBAT operate a single oracle with Brownian motion #981

[codecov]

Codecov Report

Merging #1725 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #1725    +/-   ##
========================================
  Coverage   74.26%   74.26%            
========================================
  Files         277      277            
  Lines        7617     7617            
  Branches      953      669   -284     
========================================
  Hits         5657     5657            
  Misses       1845     1845            
  Partials      115      115

Flag	Coverage Δ
#mobile	74.26% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
packages/mobile/src/identity/verification.ts	66.14% <0%> (ø)	⬆️

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