Implementing Redis DB support for ballerina persist feature

[daneshk]

Purpose

Addressing: ballerina-platform/ballerina-library#5054
Fixes: ballerina-platform/ballerina-library#6015

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[niveathika]

Minor comment. Other than than LGTM

[niveathika]

Do we need this and devcontainer file? Shouldnt this be kept at project level

[dinukaamarasinghe817]

We do not need the devcontainer file. Yes, this should be moved to the project level. I'll update accordingly.