feat(http): normalize HTTP headers

[JozefFlakus]

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #311

What is the new behavior?

• all HTTP headers are lower cased (normalized) unless MARBLE_HTTP_HEADERS_NORMALIZATION environment variable is set to false

Does this PR introduce a breaking change?

[x] Yes
[ ] No

[codecov[bot]]

Codecov Report

Merging #349 (44bc723) into next (46befd6) will decrease coverage by 0.69%. The diff coverage is 93.13%.

@@            Coverage Diff             @@
##             next     #349      +/-   ##
==========================================
- Coverage   94.91%   94.22%   -0.70%     
==========================================
  Files         135      158      +23     
  Lines        2242     3063     +821     
  Branches      301      361      +60     
==========================================
+ Hits         2128     2886     +758     
- Misses        110      172      +62     
- Partials        4        5       +1     

Impacted Files	Coverage Δ
packages/core/src/logger/logger.interface.ts	100.00% <ø> (ø)
packages/core/src/operators/use/use.operator.ts	50.00% <ø> (-50.00%)	:arrow_down:
packages/http/src/error/http.error.effect.ts	100.00% <ø> (ø)
packages/http/src/http.interface.ts	100.00% <ø> (ø)
packages/http/src/index.ts	0.00% <0.00%> (ø)
packages/http/src/router/http.router.matcher.ts	100.00% <ø> (ø)
...messaging/src/transport/strategies/tcp.strategy.ts	0.00% <0.00%> (ø)
packages/middleware-cors/src/applyHeaders.ts	100.00% <ø> (ø)
packages/middleware-cors/src/checkOrigin.ts	100.00% <ø> (ø)
packages/middleware-cors/src/configureResponse.ts	100.00% <ø> (ø)
... and 158 more

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