Store the settlement_service_type of dvp delivery when indexing

[purplesmoke05]

Close #674

[github-actions[bot]]

Coverage Report •

File	Stmts	Miss	Cover	Missing
indexer_dvp_delivery.py	329	34	89%	110–111, 117–119, 292, 305, 346–347, 367–368, 383, 396, 411–412, 427, 440, 471–472, 487, 500, 531–532, 547, 560, 575–576, 649, 831–832, 838–841
db
idx_dvp_delivery.py	42	1	97%	100
issuer
settlement_issuer.py	155	10	93%	168, 296, 298, 434, 436, 444, 452, 460, 571–572
misc
settlement_agent.py	164	2	98%	218, 318
schema
settlement.py	148	0	100%
TOTAL	12886	1131	91%

Tests	Skipped	Failures	Errors	Time
1875	0 :zzz:	0 :x:	0 :fire:	35m 47s :stopwatch: