improvement: move incremental client from fmg to meros

[maraisr]

With this PR I aim to replace fmg with meros, for better isomorphic nature and ease of use.

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relates: #1770

[acao]

ah, yeah you have to run yarn build at the root first! it will probably pass in CI, no worries

[acao]

these test failures are strange! just missing arguments from some assertions

[acao]

ah, still the unrelated test failures that shouldn't be happening. ill take a look!

[acao]

ah, @maraisr you need to update the tests because you change how createMultipartFetcher is invoked! they are related as it turns out. you just need to add fetch to a few assertions

[codecov]

Codecov Report

Merging #1774 (ae9137f) into feat/build-fetcher-util (26feeeb) will decrease coverage by 0.03%.
The diff coverage is 16.00%.

@@                     Coverage Diff                     @@
##           feat/build-fetcher-util    #1774      +/-   ##
===========================================================
- Coverage                    65.72%   65.69%   -0.04%     
===========================================================
  Files                           85       85              
  Lines                         5083     5087       +4     
  Branches                      1610     1605       -5     
===========================================================
+ Hits                          3341     3342       +1     
- Misses                        1715     1718       +3     
  Partials                        27       27              

Impacted Files	Coverage Δ
packages/graphiql-create-fetcher/src/lib.ts	55.10% <0.00%> (-3.60%)	⬇️
packages/graphiql/src/components/GraphiQL.tsx	57.80% <20.00%> (+0.06%)	⬆️
...kages/graphiql-create-fetcher/src/createFetcher.ts	65.62% <100.00%> (ø)

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