Support nested paths in field config specifically `map` type members

[mbaijal]

Is your feature request related to a problem?
This is an enhancement to the existing feature described here and implemented here but for maps.

Describe the solution you'd like
Enable getMemberByPath to handle such map type paths as follows -

case "map":
    shape = shapeRef.Shape.ValueRef.Shape

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Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[a-hilaly]

/remove-lifecycle stale

[ack-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close.
Provide feedback via https://github.com/aws-controllers-k8s/community.
/lifecycle stale

[ack-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.
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/lifecycle rotten

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/close

[ack-bot]

@ack-bot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Provide feedback via https://github.com/aws-controllers-k8s/community.
/close

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