Allow set arbitrary parameters multiple times

[weixu365]

@tillahoffmann Fixes based on comments in https://github.com/testcontainers/testcontainers-python/pull/34

• Merge kwargs instead of override
• Using kwargs to store all the settings to prevent named parameter conflict with kwargs

[codecov-io]

Codecov Report

Merging #35 into master will increase coverage by 0.2%. The diff coverage is 94.44%.

@@            Coverage Diff            @@
##           master      #35     +/-   ##
=========================================
+ Coverage   77.57%   77.77%   +0.2%     
=========================================
  Files          17       17             
  Lines         330      324      -6     
  Branches       21       22      +1     
=========================================
- Hits          256      252      -4     
+ Misses         59       58      -1     
+ Partials       15       14      -1

Impacted Files	Coverage Δ
testcontainers/core/generic.py	100% <100%> (ø)	:arrow_up:
testcontainers/core/container.py	87.5% <93.75%> (+1.6%)	:arrow_up:

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[weixu365]

@tillahoffmann, @SergeyPirogov Could you please have a review on this PR when you available?

[Can-Sahin]

this is quite useful. Why isn't getting merged? Any reason?