fix(@aws-amplify/datastore): Nullable Arrays

[seang96]

Issue #, if available: #6500

Description of changes:
This is based off of ondojo's initial PR tagged above.
I added a new field that gets stored in the schema generated from @aws-amplify/cli called isArrayRequired.
PR to update @aws-amplify/cli - aws-amplify/amplify-cli#5327
I added tests for the nullable arrays

This PR should support the table below:

declaration	null	[]	[null]	[{ foo: 'BAR' }]
[Type!]!	no	yes	no	yes
[Type]!	no	yes	yes	yes
[Type!]	yes	yes	no	yes
[Type]	yes	yes	yes	yes

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

[lgtm-com]

This pull request introduces 1 alert when merging 9a763a7 into 6abbf50 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[codecov]

Codecov Report

Merging #6784 into main will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #6784   +/-   ##
=======================================
  Coverage   73.34%   73.34%           
=======================================
  Files         213      213           
  Lines       13159    13165    +6     
  Branches     2568     2571    +3     
=======================================
+ Hits         9651     9656    +5     
- Misses       3314     3315    +1     
  Partials      194      194           

Impacted Files	Coverage Δ
packages/datastore/src/types.ts	84.74% <ø> (ø)
packages/datastore/src/datastore/datastore.ts	85.02% <100.00%> (-0.03%)	⬇️

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[iartemiev]

Looks great! Just a minor naming change requested

[iartemiev]

Hey @seang96, thank you so much for this PR! I talked it over with @yuth from the CLI team and we wanted to see if you could change isArrayRequired -> isArrayNullable in this PR, as well as in your related CLI PR.
We'll merge both PRs promptly once the change has been made.

[seang96]

Hey @seang96, thank you so much for this PR! I talked it over with @yuth from the CLI team and we wanted to see if you could change isArrayRequired -> isArrayNullable in this PR, as well as in your related CLI PR.
We'll merge both PRs promptly once the change has been made.

I pushed the respective changes! Sorry for the delay, got caught up in other projects.

[iartemiev]

No worries, thanks for updating! We should flip the behavior as well though since isNullable has effectively the opposite meaning of isRequired, i.e. where you had isArrayRequired should now be !isArrayNullable. Sorry for the confusion.

[seang96]

No problem, I did not think about the implications for the name change haha. Commit is pushed.

[github-actions]

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