feat(server): add option to customise JWT payload of accessToken

[pradel]

Fix #542
Close #883

Created from #883

@huikaihoo I created a new pull request because I was not able to push on your branch

[codecov]

Codecov Report

Merging #984 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #984   +/-   ##
=======================================
  Coverage   95.19%   95.19%           
=======================================
  Files          80       80           
  Lines        1788     1791    +3     
  Branches      384      387    +3     
=======================================
+ Hits         1702     1705    +3     
  Misses         84       84           
  Partials        2        2           

Impacted Files	Coverage Δ
packages/server/src/accounts-server.ts	91.03% <100.00%> (+0.20%)	⬆️
packages/server/src/utils/tokens.ts	100.00% <100.00%> (ø)

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[pradel]

Thanks @huikaihoo, sorry that this one took so long to get merged, I will release a new version later today!