refactor: move out bits/bytes enum to utils

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8d078f8) 31.61% compared to head (3edf014) 31.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1211   +/-   ##
=======================================
  Coverage   31.61%   31.61%           
=======================================
  Files          97       97           
  Lines       16502    16502           
=======================================
  Hits         5217     5217           
  Misses      11285    11285           

Flag	Coverage Δ
macos-12	33.18% <ø> (ø)
ubuntu-latest	33.19% <ø> (ø)
windows-2019	33.43% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/app.rs	1.49% <ø> (ø)
src/canvas/widgets/network_graph.rs	0.00% <ø> (ø)
src/data_conversion.rs	14.54% <ø> (ø)
src/lib.rs	2.90% <ø> (ø)
src/options.rs	80.52% <ø> (ø)
src/utils/data_units.rs	100.00% <ø> (ø)

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