Implementation of the dynamic base fee in common architecture features.

[jimni1222]

Proposed changes

This PR introduces implementation of the dynamic base fee in common architecture features.

• Support getSuggestedGasPrice function for transaction.
• Set gasPrice with dynamic base fee logic in Method(RPC API).
• Modified to use getSuggestedGasPrice instead of _klaytnCall.getGasPrice in fillTransaction function.

I can test those features when Klaytn source code is applied for this.

Note This PR includes #664, so please review #664 first.

Types of changes

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• Bugfix
• New feature or enhancement
• Others

Checklist

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• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
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• Any dependent changes have been merged and published in downstream modules

Related issues

related to #662

Further comments

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