cli: Add --output-format=PARTIQL_PRETTY for non-interactive use

[evanj]

Description of changes:

The interactive REPL prints PartiQL results in a "pretty" format with
newlines and indentation. The non-interactive command line tool does
not. This adds --output-format=PARTIQL_PRETTY to print results in the
same format.

Example result without --output-format:

<<{'employeeName': 'Bob Smith', 'projectName': 'AWS Redshift Spectrum querying'}, {'employeeName': 'Jane Smith', 'projectName': 'AWS Redshift security'}>>

Example result with --output-format=PARTIQL_PRETTY

<<
  {
    'employeeName': 'Bob Smith',
    'projectName': 'AWS Redshift Spectrum querying'
  },
  {
    'employeeName': 'Jane Smith',
    'projectName': 'AWS Redshift security'
  }
>>

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[alancai98]

Thanks so much for the contribution! For documentation purposes of the new output format, could you also add PARTIQL_PRETTY to

partiql-lang-kotlin/cli/src/org/partiql/cli/main.kt

Line 111 in 386fda8

* * -of --output-format: output format, ION_TEXT, ION_BINARY and PARTIQL (default)

and to

partiql-lang-kotlin/docs/user/CLI.md

Line 28 in 386fda8

(ION_TEXT|ION_BINARY|PARTIQL)>

[alancai98]

Looks good. Thanks again!