[chore] v1.4.7 Upgrade

[patrick-ogrady]

This PR updates rosetta-sdk-go to use rosetta-specifications@v1.4.7. Notably, this adds support for "indexer" endpoints!

Changelog

• update codegen.sh
• add types.X methods for string, int64, and bool to make it easier to handle pointers
• pass existing tests

Future PR

• add new endpoints to fetcher
• add assertions for new endpoints (both client + server)

[coveralls]

Pull Request Test Coverage Report for Build 11011

• 22 of 54 (40.74%) changed or added relevant lines in 5 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 78.924%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
asserter/block.go	12	14	85.71%
asserter/asserter.go	2	5	40.0%
fetcher/account.go	8	11	72.73%
types/utils.go	0	9	0.0%
asserter/server.go	0	15	0.0%

Files with Coverage Reduction	New Missed Lines	%
asserter/block.go	1	90.21%

Totals
Change from base Build 10952:	-0.2%
Covered Lines:	7392
Relevant Lines:	9366

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💛 - Coveralls