sign typed message and updating public rpcs

[Husienvora]

adding sign typed transaction method in the vault ,

[github-actions]

Coverage Report (79%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	78.89	69.58	90.1	79.2
chains	94.73	50	100	94.73
index.js	94.73	50	100	94.73	55
config	100	100	100	100
index.js	100	100	100	100
constants	100	100	100	100
index.js	100	100	100	100
constants/responses	100	100	100	100
index.js	100	100	100	100
lib	79.75	71.57	91.42	79.69
keyring.js	77.37	70.2	91.22	77.27	53, 70, 80, 84–85, 168–188, 241, 284–294, 371–449, 478, 496–497, 507, 513, 522, 528, 558–567, 572, 586–591, 601, 607, 616, 622, 638, 644, 658–663, 672, 678, 687, 693, 701, 715, 738, 768–781, 871–874, 1085, 1115, 1141–1142, 1161–1278, 1380, 1409–1412, 1436–1438, 1485, 1544–1547, 1575, 1620, 1626
vault.js	92.38	83.67	92.3	92.38	24, 34, 56–58, 87, 100, 116
utils	71.75	55.38	82.35	73.8
helper.js	71.75	55.38	82.35	73.8	9–16, 89–99, 132, 155, 167–169, 178–182, 203–205, 232, 250, 268, 335–367