feat!: Move inclusion of content in info object behind feature flag

[trallnag]

Fixes issue #234.

Related to pull request #233.

[codecov]

Codecov Report

Merging #238 (0449e8d) into master (e4b9d84) will increase coverage by 0.10%.
The diff coverage is 100.00%.

❗ Current head 0449e8d differs from pull request most recent head 31d2252. Consider uploading reports for the commit 31d2252 to get more accurate results

@@            Coverage Diff             @@
##           master     #238      +/-   ##
==========================================
+ Coverage   95.58%   95.68%   +0.10%     
==========================================
  Files           5        5              
  Lines         340      348       +8     
==========================================
+ Hits          325      333       +8     
  Misses         15       15              

Impacted Files	Coverage Δ
...ometheus_fastapi_instrumentator/instrumentation.py	97.14% <100.00%> (+0.04%)	⬆️
...rc/prometheus_fastapi_instrumentator/middleware.py	97.91% <100.00%> (+0.16%)	⬆️

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