fix: 4337 issues

[yagopv]

What it solves

Resolves #903

• Convert dates (validAfter and validUntil) for transaction service
• Concat paymaster and paymasterData fields from transaction service
• Adjust pimlico estimator
• use addSafeOperation() with the API response instead calculating values
• Update bundler to v2
• Fix issue in send-safe-operations playground
• Use preparedSignature from transaction service

[yagopv]

paymasterAndData issues solved as well here safe-global/safe-eth-py#1210

[coveralls]

Pull Request Test Coverage Report for Build 9906664438

Details

• 3 of 4 (75.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 74.631%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/relay-kit/src/packs/safe-4337/Safe4337Pack.ts	1	2	50.0%

Totals
Change from base Build 9809678697:	0.2%
Covered Lines:	789
Relevant Lines:	987

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💛 - Coveralls