Return limits and remaining count in headers

[ChaituVR]

🔴 Need a new version from snapshot-labs/keycard.js#7

Summary of changes:

• Use new values returned from keycard.js
• Return remaining count, limits and reset time in headers
  
• Fallback to default rate limit if the max number of requests on keycard is reached

How to test:

1. Install the new version of keycard.js with yarn link or wait for the new version to be released
2. Run the server
3. Go to http://localhost:3000/graphql?apiKey=1234 (replace apiKey if required)
4. Try sending the requests and look into the networks tab in console
5. It should display the correct limits and remaining count
6. If it reaches our limit, it should fall back to the default rate limit (express-rate-limit)

[ChaituVR]

These lint errors should be fixed once we install new version of keycard.js

[wa0x6e]

Let's merge and publish the new keycard.js version first, can not even yarn dev because of typescript error

[ChaituVR]

Using keycard.js from github for now. will use from npm once it is published

[codecov]

Codecov Report

Merging #634 (5346755) into master (6f2649f) will not change coverage.
Report is 5 commits behind head on master.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master    #634   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          38      38           
  Lines        1662    1668    +6     
  Branches       38      38           
======================================
- Misses       1624    1630    +6     
  Partials       38      38           

Files Changed	Coverage Δ
src/helpers/keycard.ts	0.00% <0.00%> (ø)
src/helpers/rateLimit.ts	0.00% <0.00%> (ø)
src/index.ts	0.00% <0.00%> (ø)

[wa0x6e]

tAck