refactor: Refactor FormTextField to not require a HoC

[bryphe-coder]

Prompted from discussion here: https://github.com/coder/coder/pull/60/files#r792124373

Our current FormTextField implementation requires a higher-order component, which can be complicated to understand.

This experiments with moving it to not require being a HoC.

The only difference in usage is that sometimes, you need to provide the type like <FormTextField<FormValues> form={form} formFieldName="some-field-in-form" /> - but it doesn't require special construction.

[codecov]

Codecov Report

Merging #70 (0f26a37) into main (9cf4f7c) will decrease coverage by 0.18%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   71.09%   70.90%   -0.19%     
==========================================
  Files          82       82              
  Lines        3376     3372       -4     
  Branches       49       49              
==========================================
- Hits         2400     2391       -9     
- Misses        770      774       +4     
- Partials      206      207       +1     

Flag	Coverage Δ
unittest-go-macos-latest	67.12% <ø> (-0.33%)	⬇️
unittest-go-ubuntu-latest	69.63% <ø> (-0.11%)	⬇️
unittest-go-windows-latest	67.12% <ø> (-0.15%)	⬇️
unittest-js	72.86% <93.33%> (-0.24%)	⬇️

Impacted Files	Coverage Δ
site/components/Form/FormTextField.tsx	93.75% <93.10%> (-0.54%)	⬇️
site/components/SignIn/SignInForm.tsx	100.00% <100.00%> (ø)
peer/conn.go	74.25% <0.00%> (-1.50%)	⬇️

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[bryphe-coder]

Thanks for the idea @kylecarbs !