Add dynamic padding support

[hzhongmj]

When table has a whitespace as border, it can look quite cramped, especially when the cells have text with whitespaces. For example, below is a sample output of a certain table:

     Line  User  Idle     Location
-- ------- ----- -------- --------------------------------------
   1 con 0 root  07:29:04 -
   2 vty 3 root  09:12:23 10.243.214.227
   3 vty 5 root  07:09:36 10.243.214.212
*  4 vty 7 admin 00:00:00 fdfd:5c41:712d:d08e:2ce2:7eff:fea5:ae5

As you can see most of the columns (especially the second and third) are separated by just a single whitespace which makes it rather hard to read.

The idea of smart padding is to detect that two adjacent cells are only separated by one whitespace, in which case we add one more whitespace between the two columns. With smart_padding_width=1 the above table would look like:

     Line   User   Idle      Location
-- -------- ------ --------- --------------------------------------
   1 con 0  root   07:29:04  -
   2 vty 3  root   09:12:23  10.243.214.227
   3 vty 5  root   07:09:36  10.243.214.212
*  4 vty 7  admin  00:00:00  fdfd:5c41:712d:d08e:2ce2:7eff:fea5:ae5

It basically tries to make sure texts between adjacent cells have at least specified number of whitespaces (excluding the border).

Smart padding does not take effect if one of the condition is true:

1. There is no extra space left
2. The left column is right aligned and the right column is left aligned
3. The vertical border is not ' '

[codecov]

Codecov Report

❌ Patch coverage is 99.44134% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.89%. Comparing base (b807695) to head (ba992fe).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils/formatting/smart_padding.rs	99.39%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   96.60%   96.89%   +0.29%     
==========================================
  Files          16       17       +1     
  Lines        1530     1705     +175     
==========================================
+ Hits         1478     1652     +174     
- Misses         52       53       +1     

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[Nukesor]

Heyo :)

I'll probably take a while to review this. There's a lot going on right now and I'm not sure when I find the mindset to drill into comfy-table once more ❤️

[hzhongmj]

Hi Nukesor, is it still something you are planning to review?