Move all Kiln-related encoding to kiln-encoder.builder

[iamacook]

Summary

In order to test our KilnDecoder we encode both function/event data for specific methods. All other decoders have defined encoders. Currently, only the event-specific encoding is located within one for Kiln.

This moves all function-specific data encoding to the Kiln-specific encoder.

Changes

• Create encoders for deposit, requestValidatorsExit and batchWithdrawCLFee.
• Cleanup DepositEvent encoder implementation.
• Use above encoders in relative tests.

[coveralls]

Pull Request Test Coverage Report for Build 11032937275

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.775%

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Totals
Change from base Build 11032628216:	0.0%
Covered Lines:	8371
Relevant Lines:	8848

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💛 - Coveralls