676: Merge enhanced / standard text inputs

[tomdye]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

• removes enhanced-text-input
• adds leading / trailing properties to text-input
• removes labelAfter property as does not make sense with helperText
• moves most of the separate render functions into the main render

Resolves #676

[codecov]

Codecov Report

Merging #680 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #680      +/-   ##
==========================================
- Coverage   99.01%   98.97%   -0.04%     
==========================================
  Files          44       43       -1     
  Lines        3335     3308      -27     
  Branches      921      914       -7     
==========================================
- Hits         3302     3274      -28     
- Misses         33       34       +1

Impacted Files	Coverage Δ
src/text-input/index.ts	100% <100%> (ø)	⬆️
src/split-pane/index.ts	98.96% <0%> (-1.04%)	⬇️

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