[Improvement]: Revisit compiler plugin design

[azinneera]

Description

After the initial design, there have been a lot of use cases coming in for code generation and analysis which cannot be achieved by the current design. Following are some of the reasons to revisit the current design:

1. Generating IDL clients - The plugin interface needs an API to check if the URI can be handled by the plugin
2. bal persist - The feature needs to generate code in existing modules

Describe your problem(s)

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Describe your solution(s)

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Related area

-> Compilation

Related issue(s) (optional)

https://github.com/ballerina-platform/ballerina-spec/issues/1179

Suggested label(s) (optional)

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Suggested assignee(s) (optional)

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