feat: call_input_spacing rule

[adthrasher]

This pull request adds a new rule to wdl-lint.

• Rule Name: CallInputSpacing

Ensures that the input keyword follows the opening brace and exactly one space. Ensures that if more than one input exists, they are on separate lines. Ensures that the assignment operator ("=") is surrounded by whitespace.

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Rule specific checks:

• You have added the rule as an entry within RULES.md.
• You have added the rule to the rules() function in wdl-lint/src/lib.rs.
• You have added a test cases in wdl-lint/tests/lints that covers every
  possible diagnostic emitted for the rule within the file where the rule
  is implemented.
• You have run wdl-gauntlet --refresh to ensure that there are no
  unintended changes to the baseline configuration file (Gauntlet.toml).
• You have run wdl-gauntlet --refresh --arena to ensure that all of the
  rules added/removed are now reflected in the baseline configuration file
  (Arena.toml).

[adthrasher]

@a-frantz - This one is likely to end up being controversial given the number of new entries in Arena.

[a-frantz]

@a-frantz - This one is likely to end up being controversial given the number of new entries in Arena.

Yea, and I think anytime we're about to add a bunch of entries to Arena we should step back and think hard before hitting merge. That said I think these numbers are slightly inflated by your implementation "double-reporting" certain spans? Maybe we should cap it at one diagnostic per-call-statement?

[peterhuene]

This is looking pretty solid! Just a few feedback comments.

[a-frantz]

(can you refresh base gauntlet to get the latest workflows hash?)
Other than that this LGTM.