Feat - Allowing raw_input and timestamp flags

[1griffy]

As of now the cli only accepts file input
However for usablility sake, users should also be allowed to pass simple command line input

A useful feature could be if users can timestamp as input i.e. allow decrypt only after new year 2024

This PR aims to add that

[CluEleSsUK]

Thank you so much for your first contribution!
I definitely agree with the change in spirit and the PR looks pretty close, but could you address the following:

• add a few unit tests around the flag combos to make sure they work
• add a few e2e tests for the CLI in tlock_test.go
• run golangci-lint run --fix over everything (you may have already done this!)

[AnomalRoil]

The current CLI supports stdin input:

echo "hello 24th" | tle -e -D 1m -a

works on my machine and gives me:

-----BEGIN AGE ENCRYPTED FILE-----
YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IHRsb2NrIDE1NDcwMTQgZGJkNTA2ZDZl
Zjc2ZTVmMzg2ZjQxYzY1MWRjYjgwOGM1YmNiZDc1NDcxY2M0ZWFmYTNmNGRmN2Fk
NGU0YzQ5MwpvaHh6Q2c2M204UHNWNUhLUWN5dmNaeHd6R2x1TW4vVkIxblo2Yzhq
YXhNSXUvdS9seUpmc0hBNzdPaUZIN3YyCkdMT3N2VTZMcTdUNEdoV3MzSFRqTC9U
dWM0Y3BWRkhzWVhKUDlqcXcreDRET1hadmp4WXBHMDdFdjdlNVdnaEMKQlI3ZUtz
N0NUc01XbHFtUUx6QzFvWkxjenl1N3NCY0crZUc5enpTTVZDOAotLS0gQ0ZoRFY3
a093dEhCL3poZTJ4RXlteFI2bEdLdkZNYzBLZkZXUHFjM2hjZwqqcqLQ4Xg/xIrz
xSPBM6rWk4g0g2nRbWVXtGMIPU0PAXu7uEPU7+wxAM5O
-----END AGE ENCRYPTED FILE-----

which correctly decrypts too:

echo """-----BEGIN AGE ENCRYPTED FILE-----
YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IHRsb2NrIDE1NDcwMTQgZGJkNTA2ZDZl
Zjc2ZTVmMzg2ZjQxYzY1MWRjYjgwOGM1YmNiZDc1NDcxY2M0ZWFmYTNmNGRmN2Fk
NGU0YzQ5MwpvaHh6Q2c2M204UHNWNUhLUWN5dmNaeHd6R2x1TW4vVkIxblo2Yzhq
YXhNSXUvdS9seUpmc0hBNzdPaUZIN3YyCkdMT3N2VTZMcTdUNEdoV3MzSFRqTC9U
dWM0Y3BWRkhzWVhKUDlqcXcreDRET1hadmp4WXBHMDdFdjdlNVdnaEMKQlI3ZUtz
N0NUc01XbHFtUUx6QzFvWkxjenl1N3NCY0crZUc5enpTTVZDOAotLS0gQ0ZoRFY3
a093dEhCL3poZTJ4RXlteFI2bEdLdkZNYzBLZkZXUHFjM2hjZwqqcqLQ4Xg/xIrz
xSPBM6rWk4g0g2nRbWVXtGMIPU0PAXu7uEPU7+wxAM5O
-----END AGE ENCRYPTED FILE-----""" | tle -d

[AnomalRoil]

Almost ready!

[1griffy]

Following up on this one - if you need this I can resolve the conflicts

[CluEleSsUK]

sorry this slipped through the net - if you could resolve the conflicts we'll get it merged asap!