chore: add descriptions to env structures

[hgiasac]

This pull request improves the documentation and schema annotations for environment variable wrapper types across the codebase, making the intent and usage of these fields clearer for both developers and tools that consume the schema. Additionally, it disables the lll linter in the GolangCI configuration.

The most important changes are:

Schema annotation and documentation improvements:

• Added descriptive description fields to the Value and Variable struct tags for all environment wrapper types (such as EnvAny, EnvString, EnvInt, EnvBool, EnvFloat, EnvMapString, EnvMapInt, EnvMapFloat, EnvMapBool, EnvStringSlice, EnvIntSlice, EnvFloatSlice, EnvBoolSlice). These descriptions clarify that Value is the default literal if the environment variable is empty, and Variable is the environment variable to be evaluated. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]

Linting configuration:

• Disabled the lll (line length linter) in .golangci.yml to allow longer lines, which are now required due to the more descriptive struct tags.