feat(blueprints): support starting new blueprints after startup

[paul-nechifor]

Problem

• Module coordinator doesn't allow starting multiple blueprints.

Closes DIM-XXX

Solution

• Blueprints are now fully immutable. They cannot be built. You have to use a ModuleCoordinator to build a blueprint.
• Restructured the files and moved related code into the dimos/core/coordinator directory.

Breaking Changes

• The import locations have changed.
• Blueprint.build was removed. You have to use a ModuleCoordinator to build.

How to Test

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