Parsing `.env` files about hulak HOT 3 CLOSED

this completes the parsing mechanics functionality. Other issues will be completed in the next ticket

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1. Initially working on manually parsing each .env file since I don't want any fluff. But, if this becomes too much of a headache, here are two options.
   a. https://github.com/caarlos0/env
   b. https://github.com/kelseyhightower/envconfig

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Completed Tasks.

1. Parse .env Files ✅

   • Using Scanner to read file line by line.
   • Then splitting the line around =.
   • Trimming all the empty spaces. So, no empty spaces are supported.
   • Currently only string is supported but I did write a function to parse the input string and convert it to either
     • Float, int or bool
   • Empty lines are not considered a secret.

2. Store and Manage Environment Variables: ✅

   • Variables are kept in Map and needs to be called each time the program runs. It's not saved in os.SetEnv.

3. Implement Variable Reference Resolution: ✅

   • envparser.SubstituteVariable is used to replace the variable in the string surrounded with {{keyName}}

4. Environment Switching Capability: Environment can be switched with -env flag. ✅

5. Default to GLOBAL Environment: ✅

6. Testing and Validation: ✅

7. Variable Error Resolution: ✅

   • If variables are not found, then the error is throws in red color. Error: unresolved variable and program exists with error code 1

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