fix(amplify-appsync-simulator): appsync scalars

[bboure]

Issue #, if available:
Fixes #5207

Description of changes:

Several issues here.

1. AWS scalars were not used at all
   AWS scalars were defined, but never injected in the schema. This is now fixed.
   Please let me know if this was intentional (for some reason)

2. AWSPhone was needs to be instantiated in order to be injected into the schema.
   Instead, the class itself was passed.
   AWSPhone also seems to accept some options for the country. Since this was not used at all until now, I just left the defaults.

3. AWSJSON
   Finally, this fixes Value returned by amplify-appsync-simulator for AWSJSON fields doesn't match AppSync #5207
   AWSJSON are stringified in AppSync but were returned as objects in the simulator.

According to the doc and the reverse engineering I have been doing, it should act as follow:

As an Input
JSON strings are parsed as values before getting to mapping template. This means:
"{\"Foo\":\"Bar\"}" becomes {Foo: "Bar"} (object, or Map)
"true" (the string) becomes true (the boolean)
"1" (the string) becomes 1 (the integer)
"\"Hello\"" (double quotes are important) becomes the Hello string
etc.

Any array of the above should also work. Example: "[\"Hello\", \"World\"]"

"Hello" is an invalid json representation and fails.
Any non-string value should fail.

As an output
Basically, any output will be encoded as a JSON
{Foo: "Bar"} becomes {"Foo": "Bar"}, and so on... (Basically, the reverse of the above)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #5705 into master will increase coverage by 0.02%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #5705      +/-   ##
==========================================
+ Coverage   58.02%   58.04%   +0.02%     
==========================================
  Files         410      410              
  Lines       18769    18780      +11     
  Branches     3556     3753     +197     
==========================================
+ Hits        10890    10901      +11     
+ Misses       7215     7195      -20     
- Partials      664      684      +20     

Impacted Files	Coverage Δ
...ages/amplify-appsync-simulator/src/schema/index.ts	19.40% <ø> (ø)
...sync-simulator/src/schema/appsync-scalars/index.ts	40.27% <75.00%> (+10.76%)	⬆️
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	34.65% <0.00%> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
...ges/amplify-util-mock/src/CFNParser/stack/index.ts	0.00% <0.00%> (ø)
...es/amplify-util-mock/src/api/resolver-overrides.ts	0.00% <0.00%> (ø)
...es/graphql-transformer-core/src/stripDirectives.ts	35.29% <0.00%> (ø)
.../amplify-cli-core/src/state-manager/pathManager.ts	67.08% <0.00%> (ø)
.../amplify-util-mock/src/utils/lambda/loadMinimal.ts	0.00% <0.00%> (ø)
... and 12 more

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[SwaySway]

LGTM - thanks for the contribution!

[ElvenMonky]

@bboure Thanks a lot for figuring this out!

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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