Need to revisit Error inheritance in all standard library modules

[daneshk]

The way we use distinct error in most standard libraries are not correct. We need to create error hierarchy like below,

// Level 1
public type Error distinct error;

// Level 2
public type ClientError distinct Error;

// Level 3
public type GenericClientError distinct ClientError;

Reference PR: ballerina-platform/module-ballerina-http#211

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