feat: dappkit fixes

[rodolfopietro97]

Description

Fixes needed to integrate Dappkit

Checklist

• Change signer call method return type to string
• Abstract provider internal wallet AND getDelegatorSync

[github-actions]

Test Coverage

Summary

Lines	Statements	Branches	Functions
	100% (3386/3386)	100% (783/783)	100% (701/701)

Title	Tests	Skipped	Failures	Errors	Time
core	485	0 💤	0 ❌	0 🔥	1m 5s ⏱️
network	657	0 💤	0 ❌	0 🔥	3m 35s ⏱️
errors	48	0 💤	0 ❌	0 🔥	11.116s ⏱️

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@types/[email protected]	None	+2	1.69 MB	types
npm/@vechain/[email protected]	Transitive: network	+23	22.5 MB
npm/@vechain/[email protected]	None	0	0 B
npm/@vechain/[email protected]	Transitive: environment, filesystem, network	+12	2.47 MB
npm/[email protected]	None	0	0 B

🚮 Removed packages: npm/@babel/[email protected], npm/@babel/[email protected], npm/@babel/[email protected], npm/@babel/[email protected], npm/@babel/[email protected], npm/@babel/[email protected], npm/@babel/[email protected], npm/@babel/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected]

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