chore(apps/whale): refactor to jellyfish conventions

[eli-lim]

To merge after build and release workflow is ready

Then we can freeze whale and move everyone over for 100% feature parity and release stability before performing the refactor

What this PR does / why we need it:

Follow-up PR to adapt whale code / structure to jellyfish conventions:

• Consolidate unit tests and e2e tests into __tests__ with mirrored directory structure
• Rename most files to PascalCase
• Shorten imports

Which issue(s) does this PR fixes?:

• Part of /apps/whale-api - Consolidation & Migration  #977
• Follow-up based on chore(whale-api): migrate whale to apps/whale #1248

Additional comments?:

• I've decided to keep the naming of _module files as it helps to distinguish the entrypoint of each module
• Some files are prefixed with _ because I think it makes sense to distinguish their private / internal nature. An alternative is to introduce a subdirectory to separate the concerns.

Status

On hold - let's complete the migration first with 100% feature parity before we proceed with refactoring

[codeclimate]

Code Climate has analyzed commit 32d5b35 and detected 170 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	59
Duplication	111

View more on Code Climate.

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[codecov]

Codecov Report

Merging #1277 (32d5b35) into main (3623874) will increase coverage by 2.33%.
The diff coverage is 99.72%.

@@            Coverage Diff             @@
##             main    #1277      +/-   ##
==========================================
+ Coverage   86.50%   88.84%   +2.33%     
==========================================
  Files         331      331              
  Lines        9582     9582              
  Branches     1174     1174              
==========================================
+ Hits         8289     8513     +224     
+ Misses       1223     1018     -205     
+ Partials       70       51      -19     

Impacted Files	Coverage Δ
apps/whale/src/AppConfiguration.ts	100.00% <ø> (ø)
apps/whale/src/api/FeeController.ts	100.00% <ø> (ø)
apps/whale/src/api/Subsidy.ts	91.66% <ø> (ø)
apps/whale/src/api/_core/ApiError.ts	28.57% <ø> (ø)
apps/whale/src/api/_core/ApiQuery.ts	71.42% <ø> (ø)
apps/whale/src/api/_core/ApiResponse.ts	100.00% <ø> (ø)
apps/whale/src/api/_core/ApiVersion.ts	100.00% <ø> (ø)
apps/whale/src/api/cache/GlobalCache.ts	100.00% <ø> (ø)
apps/whale/src/database/Database.ts	100.00% <ø> (ø)
apps/whale/src/database/database.spec/_fixtures.ts	100.00% <ø> (ø)
... and 165 more

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[github-actions]

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