enhance(security): add body size and pluginConf/image entity size limits

[eternal-flame-AD]

This fixes #950 .

Added:

• Limit for blob and files (32MB)
• Limit for all request body content combined (64MB)

Do we need:

• Limit for total applications/clients?
• Make the limits configurable?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.73%. Comparing base (81699f7) to head (3d0c5d4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #951      +/-   ##
==========================================
+ Coverage   75.69%   75.73%   +0.03%     
==========================================
  Files          61       61              
  Lines        2786     2802      +16     
==========================================
+ Hits         2109     2122      +13     
- Misses        523      525       +2     
- Partials      154      155       +1     

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