feat(ISSUE-2): Add secure flag (no_env) to pass secrets as args instead of env

[narenaryan]

Description

The current mode only supports passing secrets fetched as environment variables. There is another secure way to pass secrets & sensitive info via STDIN args.

env_file: .env
secret_name: nyell-db-creds
vault: aws
no_env: true

and this will use ARGS instead of environment. This is much secure way.

[coveralls]

Pull Request Test Coverage Report for Build 11656818606

Details

• 0 of 10 (0.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.8%) to 26.136%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/whispr/cli.py	0	2	0.0%
src/whispr/utils.py	0	8	0.0%
<!--	Total:	0	10	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
src/whispr/utils.py	1	0.0%
<!--	Total:	1		-->

Totals
Change from base Build 11632122495:	-0.8%
Covered Lines:	68
Relevant Lines:	222

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💛 - Coveralls