improve package eth/filter

[gzliudan]

Proposed changes

Picked some PRs about package filter from ethereum to enhance the solution of #457:

2018-05-09 PR #16682: eth/filter: check nil pointer when unsubscribe
2018-06-14 PR #16920: eth/filters: make filterLogs func more readable
2018-07-12 PR #16734: accounts, eth, les: blockhash based filtering on all code paths
2018-07-24 PR #17234: eth/filters: improve error message for invalid filter topics
2018-07-30 PR #17267: all: simplify switches
2018-07-31 PR #17284: eth/filters: fix the block range assignment for log filter
2019-07-17 PR #19670: all: replace fmt.Print* calls with t.Log* in tests

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

Put an ✅ in the boxes that apply

• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A