refactor(controller): introduce AWS rds client to VirtualDatabase and DatabaseChaos controller

[mlycore]

What is changed and how it works?

Close #xxx

What's Changed:

Related changes

• Update golang-sdk
• Introduce AWS client

[codecov[bot]]

Codecov Report

Merging #402 (17f87bc) into master (df61eb4) will increase coverage by 6.48%. The diff coverage is 82.36%.

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
+ Coverage   66.97%   73.46%   +6.48%     
==========================================
  Files           7        6       -1     
  Lines         427      731     +304     
==========================================
+ Hits          286      537     +251     
- Misses        133      183      +50     
- Partials        8       11       +3     

Flag	Coverage Δ
unittests	73.46% <82.36%> (+6.48%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pisa-controller/pkg/proxy/server.go	20.00% <0.00%> (-2.23%)	:arrow_down:
pisa-controller/pkg/webhook/server.go	26.66% <0.00%> (ø)
pisa-controller/pkg/proxy/http.go	51.35% <44.11%> (-6.55%)	:arrow_down:
pisa-controller/pkg/webhook/injection.go	59.02% <82.56%> (+20.08%)	:arrow_up:
pisa-controller/pkg/proxy/builder.go	91.21% <93.62%> (-0.01%)	:arrow_down:

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