Support other character encodings for JWT secrets

[LoicPoullain]

Issue

Fixes #523

Solution and steps

• Add the option secretEncoding.

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

[codecov]

Codecov Report

Merging #677 into v1-8-0 will increase coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           v1-8-0     #677      +/-   ##
==========================================
+ Coverage   99.41%   99.64%   +0.22%     
==========================================
  Files          70       94      +24     
  Lines        1192     1667     +475     
  Branches      302      371      +69     
==========================================
+ Hits         1185     1661     +476     
+ Misses          7        6       -1     

Impacted Files	Coverage Δ
packages/core/src/core/config/utils.ts	100.00% <0.00%> (ø)
packages/core/src/core/routes/utils.ts	100.00% <0.00%> (ø)
packages/core/src/express/not-found.ts	100.00% <0.00%> (ø)
packages/core/src/express/create-app.ts	100.00% <0.00%> (ø)
packages/core/src/sessions/constants.ts	100.00% <0.00%> (ø)
packages/core/src/express/send-response.ts	100.00% <0.00%> (ø)
packages/core/src/core/http/http-methods.ts	100.00% <0.00%> (ø)
packages/core/src/common/utils/escape-prop.ts	100.00% <0.00%> (ø)
packages/core/src/common/utils/render.util.ts	100.00% <0.00%> (ø)
packages/core/src/openapi/utils/merge-tags.ts	100.00% <0.00%> (ø)
... and 49 more

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