Rust: implement support for non-UTF-8 data in store and lookup

[Esgrove]

Implement #246

• Support lookup for non UTF-8 data
• Support storing non UTF-8 data when storing a file
• Support storing non UTF-8 data from stdin
• Better handling for using filename as key
• Allow reading stdin for value options as well in addition to --file

For example this works now and produces a working archive that can be extracted:

./vault lookup chat-letsencrypt.tar.gz > test.tar.gz

Other examples:

 ./vault store binarytest --file ../k-ruoka-bot-detection.pdf --overwrite
./vault lookup binarytest > test.pdf
# ^ pdf works 

➜  rust git:(lookup-binary-data) ✗ cat ~/Documents/Lukkarila\ Akseli.xlsx | ./vault store xlsxtest --file -
Reading from stdin until EOF

./vault lookup xlsxtest > test.xlsx
# ^ excel works

➜  rust git:(lookup-binary-data) ✗ ./vault store --file ~/Downloads/kube-course-exercises.zip
Using filename as key: 'kube-course-exercises.zip'

➜  rust git:(lookup-binary-data) echo "testingtesting" | ./vault store stdintest --file -
Reading from stdin until EOF

➜  rust git:(lookup-binary-data) ./vault lookup stdintest
testingtesting

➜  rust git:(lookup-binary-data) ✗ echo "testingtesting" | ./vault store --overwrite test -
Reading from stdin until EOF

➜  rust git:(lookup-binary-data) ./vault lookup test
testingtesting

New long help:

➜  rust git:(lookup-binary-data) ./vault store --help
Store a new key-value pair in the vault.
You can provide the key and value directly, or specify a file to store.

Usage examples:
- Store a value: `vault store mykey "some value"`
- Store a value from args: `vault store mykey --value "some value"`
- Store from a file: `vault store mykey --file path/to/file.txt`
- Store from a file with filename as key: `vault store --file path/to/file.txt`
- Store from stdin: `echo "some data" | vault store mykey --value -`
- Store from stdin: `cat file.zip | vault store mykey --file -`

Usage: vault {store|--store|-s} [OPTIONS] [KEY] [VALUE]

Arguments:
  [KEY]
          Key name

  [VALUE]
          Value to store

Options:
  -w, --overwrite
          Overwrite existing key

  -v, --value <value>
          Value to store, use '-' for stdin

  -f, --file <filepath>
          File to store, use '-' for stdin

  -h, --help
          Print help (see a summary with '-h')

Short help:

➜  rust git:(lookup-binary-data) ./vault store -h
Store a new key-value pair

Usage: vault {store|--store|-s} [OPTIONS] [KEY] [VALUE]

Arguments:
  [KEY]    Key name
  [VALUE]  Value to store

Options:
  -w, --overwrite        Overwrite existing key
  -v, --value <value>    Value to store, use '-' for stdin
  -f, --file <filepath>  File to store, use '-' for stdin
  -h, --help             Print help (see more with '--help')