Update interface of IsValidCommittedSeal and InsertBlock by go-ibft's update

[Kourin1996]

Description

Fix the method interfaces of IBFTBackend (IsValidCommittedSeal, InsertBlock) based on go-ibft's update (0xPolygon/go-ibft#24)

Please run go mod vendor after 0xPolygon/go-ibft#24 is merged before this PR is merged

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

Manual tests

Please complete this section if you ran manual tests for this functionality, otherwise delete it

Documentation update

Please link the documentation update PR in this section if it's present, otherwise delete it

Additional comments

Please post additional comments in this section if you have them, otherwise delete it

[zivkovicmilos]

Looks good 💯

Make sure to update this branch as soon as we merge out the PR on go-ibft 🙏

[zivkovicmilos]

@Kourin1996

Make sure to also add the CommittedSeal creation in BuildCommitMessage on the backend

[codecov]

Codecov Report

Merging #677 (b44c274) into develop (b5462e0) will increase coverage by 0.05%.
The diff coverage is 45.31%.

@@             Coverage Diff             @@
##           develop     #677      +/-   ##
===========================================
+ Coverage    48.65%   48.71%   +0.05%     
===========================================
  Files          112      112              
  Lines        15364    15372       +8     
===========================================
+ Hits          7476     7488      +12     
+ Misses        7254     7252       -2     
+ Partials       634      632       -2     

Impacted Files	Coverage Δ
blockchain/subscription.go	72.00% <ø> (ø)
blockchain/testing.go	59.29% <ø> (ø)
consensus/ibft/consensus.go	0.00% <ø> (ø)
consensus/ibft/consensus_backend.go	0.00% <0.00%> (ø)
consensus/ibft/ibft.go	4.00% <0.00%> (ø)
consensus/ibft/pos.go	0.00% <ø> (ø)
consensus/ibft/sign.go	64.58% <ø> (ø)
consensus/ibft/verifier.go	0.00% <0.00%> (ø)
contracts/staking/query.go	71.42% <ø> (ø)
jsonrpc/errors.go	41.66% <ø> (ø)
... and 24 more

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