Add a code formatter following Buenos Aires Smalltalk conventions

[gcotelli]

• By default is configured to follow our conventions
• Fixed the formatting of dynamic arrays to resemble the behavior of literal arrays:
  The following code

   self doSometing: {
    self message.
    variable
  }

  is now formatted as:

   self doSometing: { self message . variable }

  only producing multiple lines if the expression is too large
• Fixed the formatting of block bodies to indent it against the block closure bracket.
  The following code:

  [
  self message.
  variable
  ] on: Error do: []

  is now formatted as:

  [
    self message.
    variable
  ] on: Error do: []

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3a171c8) to head (7129a7e).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release-candidate      #125   +/-   ##
===================================================
  Coverage             100.00%   100.00%           
===================================================
  Files                     81        81           
  Lines                   7383      7383           
===================================================
  Hits                    7383      7383           

Flag	Coverage Δ
unit	100.00% <ø> (ø)

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