feat: implement Chainlink relayer factory

[m-chrzan]

Description

This implements a factory contract to deploy Chainlink relayers (see #456).

TODO:

• [x] Make the factory Ownable and set permissions for functions that affect state
• [x] Add NatSpec documentation

LATER (follow-up PR, see #481 ):

• [x] Use a proxy for upgradability
• [x] Add integration tests that test the Factory -> Relayer -> SortedOracles -> BreakerBox flow

Other changes

• export a contractPath helper function from test/utils/Factory.sol, it's useful for computing the CREATE2 address in tests

Tested

Unit tests.

Related issues

• Fixes #459

[openzeppelin-code[bot]]

feat: implement Chainlink relayer factory

Generated at commit: dccd05c44badb59aabd802710c66ecabc656044e

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	3 3 0 13 38 57
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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