refactor: reduce memory usage

[wa0x6e]

🧿 Current issues / What's wrong ?

In helpers/spaces.ts, we're storing a duplicate array for ranked spaces, increasing memory usage.

💊 Fixes / Solution

We already have a full spaces object, ranked spaces are just a subset of that object, in a specific order. Instead of saving the ranked spaces as an array of object, we could just save the ranked space Ids in an array, reducing the memory usage.

🚧 Changes

• Convert rankedSpaces from an an array of spaces to an array of space IDs.
• Reduce the number of property in spacesMetadata to only the one currently used

Todo

• Need to add more tests
• Ultimate goal will be to remove the spaces cache entirely

🛠️ Tests

[codecov]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (695e385) 0.00% compared to head (401356a) 0.00%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #711   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          40      40           
  Lines        1998    1997    -1     
  Branches       40      40           
======================================
+ Misses       1958    1957    -1     
  Partials       40      40           

Files	Coverage Δ
src/graphql/helpers.ts	0.00% <0.00%> (ø)
src/helpers/spaces.ts	0.00% <0.00%> (ø)
src/graphql/operations/ranking.ts	0.00% <0.00%> (ø)

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