Chore: rename contracts into contracts-core

[ChiTimesChi]

Description

Renames the contracts package into contracts-core. Done to prevent confusion when a new solidity package is added (also to get rid of packages/contracts/contracts).

Changes

• moved stuff from contracts into contracts-core, including the submodules
• github workflows and config files are using the new directory

  VSCode's Search&Replace feature also prettified the edited files (e.g. a021135#diff-e2954b558f2aa82baff0e30964490d12942e0e251c1aa56c3294de6ec67b7cf5), could revert this if that's not right)

• Readme files are also updated

[codecov]

Codecov Report

Merging #176 (a350d07) into master (7d59e36) will decrease coverage by 0.02416%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##              master        #176         +/-   ##
===================================================
- Coverage   52.42812%   52.40396%   -0.02417%     
===================================================
  Files            185         185                 
  Lines           8278        8278                 
  Branches          83          83                 
===================================================
- Hits            4340        4338          -2     
  Misses          3534        3534                 
- Partials         404         406          +2     

Impacted Files	Coverage Δ
.../contracts-core/contracts/AttestationCollector.sol	97.67442% <ø> (ø)
packages/contracts-core/contracts/Destination.sol	58.57143% <ø> (ø)
packages/contracts-core/contracts/Merkle.sol	100.00000% <ø> (ø)
...ackages/contracts-core/contracts/NotaryManager.sol	87.50000% <ø> (ø)
packages/contracts-core/contracts/Origin.sol	86.53846% <ø> (ø)
...es/contracts-core/contracts/client/BasicClient.sol	100.00000% <ø> (ø)
...ackages/contracts-core/contracts/client/Client.sol	100.00000% <ø> (ø)
.../contracts-core/contracts/client/SynapseClient.sol	100.00000% <ø> (ø)
...core/contracts/client/SynapseClientUpgradeable.sol	90.90909% <ø> (ø)
...ckages/contracts-core/contracts/hubs/ReportHub.sol	100.00000% <ø> (ø)
... and 36 more

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