refactor: remove service impl trait

[coveralls]

Pull Request Test Coverage Report for Build 11922724334

Details

• 0 of 300 (0.0%) changed or added relevant lines in 5 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.1%) to 72.095%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/service/src/routes/status.rs	0	1	0.0%
crates/service/src/routes/cost.rs	0	3	0.0%
crates/service/src/routes/request_handler.rs	0	6	0.0%
crates/service/src/service.rs	0	6	0.0%
crates/service/src/service/indexer_service.rs	0	284	0.0%
<!--	Total:	0	300	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
crates/service/src/service/indexer_service.rs	3	0.0%
crates/service/src/service.rs	3	0.0%
<!--	Total:	6		-->

Totals
Change from base Build 11921592137:	0.1%
Covered Lines:	5498
Relevant Lines:	7626

---

💛 - Coveralls