fix: multiline string alignment and spacing after keywords

[mbhall88]

Addresses #123 and #149

[codecov[bot]]

Codecov Report

Merging #151 (4245181) into master (3dbd524) will decrease coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   98.25%   98.15%   -0.11%     
==========================================
  Files          12       11       -1     
  Lines         973      974       +1     
  Branches      216      217       +1     
==========================================
  Hits          956      956              
  Misses         10       10              
- Partials        7        8       +1     

Flag	Coverage Δ
unittests	98.15% <100.00%> (+<0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
snakefmt/formatter.py	99.55% <100.00%> (-0.45%)	:arrow_down:
snakefmt/logging.py	100.00% <100.00%> (ø)
snakefmt/parser/parser.py	96.49% <100.00%> (+0.09%)	:arrow_up:
snakefmt/__init__.py