feat(gateway): reenabling gateway, adding flag to enable

[distractedm1nd]

This PR is based on #1195 . It adds the gateway back onto the node (closes #1182) with it's own config, disabled by default, which is activated by the flag --gateway (closes #1183).

[codecov-commenter]

Codecov Report

Merging #1199 (f70ca3b) into main (cb92051) will increase coverage by 0.29%. The diff coverage is 54.42%.

:exclamation: Current head f70ca3b differs from pull request most recent head cb941ac. Consider uploading reports for the commit cb941ac to get more accurate results

@@            Coverage Diff             @@
##             main    #1199      +/-   ##
==========================================
+ Coverage   55.56%   55.85%   +0.29%     
==========================================
  Files         162      168       +6     
  Lines        9981    10167     +186     
==========================================
+ Hits         5546     5679     +133     
- Misses       3881     3924      +43     
- Partials      554      564      +10     

Impacted Files	Coverage Δ
nodebuilder/gateway/gateway.go	0.00% <0.00%> (ø)
nodebuilder/module.go	100.00% <ø> (ø)
nodebuilder/node.go	60.31% <ø> (ø)
nodebuilder/gateway/module.go	15.78% <15.78%> (ø)
api/gateway/server.go	66.66% <58.82%> (-2.23%)	:arrow_down:
nodebuilder/gateway/config.go	62.50% <62.50%> (ø)
cmd/celestia/full.go	38.02% <66.66%> (+1.26%)	:arrow_up:
cmd/celestia/light.go	37.50% <66.66%> (+1.26%)	:arrow_up:
api/rpc/server.go	75.00% <70.58%> (-7.15%)	:arrow_down:
nodebuilder/gateway/flags.go	75.67% <75.67%> (ø)
... and 24 more

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[distractedm1nd]

Converted to draft, only because the PR it is based on is also in draft