chore(meta): move lib manual seal as meta consensus

[canonbrother]

What this PR does / why we need it:

Moving lib_manual-seal to local for customizing in future, eg: handling DNC txs

Which issue(s) does this PR fixes?:

Fixes part of #89

Additional comments?:

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[codecov]

Codecov Report

Base: 6.63% // Head: 18.78% // Increases project coverage by +12.14% 🎉

Coverage data is based on head (03fb2cc) compared to base (8d4056f).
Patch coverage: 62.65% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #159       +/-   ##
==========================================
+ Coverage   6.63%   18.78%   +12.14%     
==========================================
  Files         14       21        +7     
  Lines       1823     2470      +647     
  Branches       3        3               
==========================================
+ Hits         121      464      +343     
- Misses      1702     2006      +304     

Impacted Files	Coverage Δ
meta/meta-defichain/prometheus/src/sourced.rs	0.00% <0.00%> (ø)
meta/meta-defichain/src/consensus/timestamp.rs	0.00% <0.00%> (ø)
meta/meta-node/src/rpc.rs	0.00% <ø> (ø)
meta/meta-node/src/service.rs	0.00% <0.00%> (ø)
meta/meta-defichain/src/error.rs	1.50% <5.08%> (ø)
meta/meta-defichain/src/rpc.rs	13.55% <13.55%> (ø)
meta/meta-defichain/prometheus/src/lib.rs	61.11% <61.11%> (ø)
meta/meta-defichain/src/finalize_block.rs	71.42% <71.42%> (ø)
meta/meta-defichain/src/seal_block.rs	89.55% <89.55%> (ø)
meta/meta-defichain/src/lib.rs	94.97% <94.97%> (ø)
... and 2 more

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[github-actions]

Docker image for defich/metachain is ready!

Built with commit aee8628

• docker pull ghcr.io/defich/metachain:aee8628af8a0c9bbe3808a0c41d10f948079a3f5
• docker pull ghcr.io/defich/metachain:pr-159