Improve action management to perform batch operations

[Thisara-Welmilla]

Suggesting improvements:

For the in-flow actions, we may need to perform following batch operation:

• Add mutiple action via single connection instead of looping
• Delete mutiple action at once
• Retrieve all action of a given action type.

Currently we are not supporting such capability, hence we need to do in a loop. The action management must be improve perform batch operation as a single transction.
Note that this requirement is already raise for AUTHENTICATION action type in the authentication extension management. Once this improvement is done, [1] must refactored to utilized it.

[1]. wso2/carbon-identity-framework#6105 (comment)