fix(http): correctly calculate `Content-Length` for an empty object

[JozefFlakus]

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] 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 new behavior?

• @marblejs/http - correctly calculate Content-Length for an empty object

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[codecov[bot]]

Codecov Report

Merging #355 (cf21d4b) into next (46befd6) will decrease coverage by 0.59%. The diff coverage is 93.61%.

@@            Coverage Diff             @@
##             next     #355      +/-   ##
==========================================
- Coverage   94.91%   94.31%   -0.60%     
==========================================
  Files         135      157      +22     
  Lines        2242     3080     +838     
  Branches      301      357      +56     
==========================================
+ Hits         2128     2905     +777     
- Misses        110      171      +61     
  Partials        4        4              

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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