feat: allow injection of master key via stdin

[darrenvechain]

Description

allow injection of master key via stdin

Type of change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Run:

echo "842497a1c69577f4be27ae2ec64751a0c0165f9011e6c27570e21f48c4af9d50" | ./bin/thor --network=main --master-key-stdin

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] New and existing E2E tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Project coverage is 62.53%. Comparing base (3d7ab12) to head (fead0f4). Report is 1 commits behind head on master.

Files	Patch %	Lines
cmd/thor/utils.go	0.00%	30 Missing :warning:
cmd/thor/main.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #772 +/- ## ========================================== - Coverage 62.58% 62.53% -0.05% ========================================== Files 199 199 Lines 18098 18142 +44 ========================================== + Hits 11326 11346 +20 - Misses 5690 5714 +24 Partials 1082 1082 ```

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[libotony]

@darrenvechain Made a small improvement, use the existing password input func when it's in terminal mode, check this commit