Add json print format mode to datafusion cli

[jimexist]

Which issue does this PR close?

Closes #294
should be merged after #290 and #292

Rationale for this change

So far we have csv table tsv, we can easily add json support

What changes are included in this PR?

add json support

Are there any user-facing changes?

no breaking changes, just new feature

[jimexist]

❯ echo 'select 123 num union all select 234 num union all select 456 num;' | cargo run --release --bin datafusion-cli -q -- --format json
[{"num":234},{"num":123},{"num":456}]
3 row in set. Query took 0 seconds.

[jimexist]

❯ cargo run --release --bin datafusion-cli -q -- --help
DataFusion 4.0.0-SNAPSHOT
DataFusion is an in-memory query engine that uses Apache Arrow as the memory model. It supports executing SQL queries
against CSV and Parquet files as well as querying directly against in-memory data.

USAGE:
    datafusion-cli [OPTIONS]

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -c, --batch-size <batch-size>    The batch size of each query, or use DataFusion default
    -p, --data-path <data-path>      Path to your data, default to current directory
    -f, --file <file>                Execute commands from file, then exit
        --format <format>            Output format (possible values: table, csv, tsv, json) [default: table]

[codecov-commenter]

Codecov Report

Merging #295 (d82ad13) into master (ee69ac8) will increase coverage by 0.11%.
The diff coverage is 98.07%.

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
+ Coverage   76.08%   76.19%   +0.11%     
==========================================
  Files         141      141              
  Lines       23734    23786      +52     
==========================================
+ Hits        18057    18123      +66     
+ Misses       5677     5663      -14     

Impacted Files	Coverage Δ
datafusion-cli/src/main.rs	0.00% <ø> (ø)
datafusion-cli/src/format/print_format.rs	90.41% <98.07%> (+90.41%)	⬆️

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[alamb]

Looks great -- thanks @jimexist

[alamb]

💯 for the tests