docs(dr): propose changes to aliafy package

Add a DR proposing change to aliasfy package to eliminate redundancy

decision records/deployments/003-aliasfy-eliminate-redundancy.md

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+# Eliminating Redundancy in Aliasified Source and Data Packages
+
+* Status: Proposed
+* Deciders: Azlam, Vu, Zhebin
+* Date: 
+
+## Context and Problem Statement
+
+The current implementation of aliasified packages in sfpowerscripts supports a 'default' directory and environment-specific directories (e.g., `dev`, `sit`, `st`). While this structure ensures flexibility, it introduces redundancy. The contents of the 'default' directory often have to be duplicated across multiple environment-specific directories. This leads to increased maintenance complexity and greater risk of errors.
+
+Existing Structure:
+
+```
+src-env-specific-alias-post
+└── main
+    ├── default
+    |   └── <contents>   
+    ├── dev
+    │   └── <contents>   
+    ├── sit
+    │   └── <contents>   
+    └── st
+        └── <contents>   
+```
+
+## Decision 
+
+To alleviate the redundancy and error-prone nature of the current approach, the proposal is to introduce a layer of inheritance for aliasified packages.
+
+Revised Structure:
+
+```
+src-env-specific-alias-post
+└── main
+    ├── default
+    |   └── <base_contents>   
+    ├── dev
+    │   └── <override_contents>   
+    ├── sit
+    │   └── <override_contents>   
+    └── st
+        └── <override_contents>   
+```
+
+- sfpowerscripts will continue to try to match the `alias` as it does today.
+- If an alias matches, the contents in the `<alias>` directory will be merged with the contents in the `default` directory.
+  - If there's a conflict, the `<alias>` directory takes precedence.
+- If the alias isn't found, it will fall back to the `default` directory.
+- If neither is found, an error will be thrown.
+
+
+- To ensure the changes do not disrupt exising users of the aliasfy feature, this enhanced aliasfy package feature has to be explictly enabled as 'aliasfyv2'in the sfdx-project.json
+
+
+By implementing this inheritance mechanism, we reduce redundancy, simplify maintenance, and minimize the scope for errors.