docs(storage): add Aurora Serverless v2 instruction

[hkford]

I updated copilot storage init command's documentation to include Aurora Serverless Flags and examples of creating both Aurora Serverless v1 and v2.

The aurora Serverless v2 feature is merged at this PR.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the Apache 2.0 License.

[codecov-commenter]

Codecov Report

Merging #4144 (42e9fb7) into mainline (c76356d) will increase coverage by 0.20%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           mainline    #4144      +/-   ##
============================================
+ Coverage     69.00%   69.21%   +0.20%     
============================================
  Files           250      250              
  Lines         35768    35885     +117     
  Branches        264      264              
============================================
+ Hits          24683    24838     +155     
+ Misses         9893     9854      -39     
- Partials       1192     1193       +1     

Impacted Files	Coverage Δ
internal/pkg/manifest/rd_web_svc.go	76.92% <0.00%> (-6.42%)	⬇️
internal/pkg/manifest/validate.go	84.06% <0.00%> (-0.33%)	⬇️
internal/pkg/cli/init.go	22.53% <0.00%> (-0.06%)	⬇️
internal/pkg/describe/errors.go	100.00% <0.00%> (ø)
internal/pkg/initialize/workload.go	74.05% <0.00%> (+0.10%)	⬆️
...rnal/pkg/deploy/cloudformation/stack/rd_web_svc.go	92.77% <0.00%> (+0.17%)	⬆️
internal/pkg/cli/validate.go	73.77% <0.00%> (+0.18%)	⬆️
internal/pkg/deploy/cloudformation/stack/env.go	73.20% <0.00%> (+0.29%)	⬆️
internal/pkg/describe/uri.go	79.08% <0.00%> (+0.65%)	⬆️
internal/pkg/aws/apprunner/apprunner.go	80.20% <0.00%> (+0.83%)	⬆️
... and 5 more

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[Lou1415926]

Thank you