feat(ocean-api): integrate playground with ocean-api

[fuxingloh]

What this PR does / why we need it:

Integrated playground to automatically run when PLAYGROUND_ENABLE is provided on regtest.

[codeclimate]

Code Climate has analyzed commit 142779b and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #928 (142779b) into main (bb5da70) will increase coverage by 1.95%.
The diff coverage is 96.29%.

@@            Coverage Diff             @@
##             main     #928      +/-   ##
==========================================
+ Coverage   93.72%   95.67%   +1.95%     
==========================================
  Files         153      156       +3     
  Lines        4748     4790      +42     
  Branches      613      617       +4     
==========================================
+ Hits         4450     4583     +133     
+ Misses        298      207      -91     

Impacted Files	Coverage Δ
apps/ocean-api/src/modules/PlaygroundModule.ts	96.15% <96.15%> (ø)
apps/ocean-api/src/modules/RootModule.ts	100.00% <100.00%> (ø)
packages/jellyfish-api-core/src/category/net.ts	71.42% <0.00%> (-28.58%)	⬇️
packages/jellyfish-api-core/src/category/server.ts	71.42% <0.00%> (-28.58%)	⬇️
packages/jellyfish-api-core/src/category/mining.ts	84.61% <0.00%> (-15.39%)	⬇️
...ages/jellyfish-api-core/src/category/blockchain.ts	93.93% <0.00%> (-6.07%)	⬇️
...h-transaction-builder/src/txn/txn_builder_loans.ts	93.93% <0.00%> (-6.07%)	⬇️
...ages/jellyfish-api-core/src/category/masternode.ts	95.23% <0.00%> (-4.77%)	⬇️
...ellyfish-transaction-signature/src/tx_signature.ts	90.80% <0.00%> (-3.45%)	⬇️
packages/jellyfish-wallet-classic/src/classic.ts	100.00% <0.00%> (ø)
... and 21 more

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[kodemon]

Just have a few questions to gain some more insights into project code conventions as I am still on the very early onboarding track.