CLI format flag

[vytautas-karpavicius]

What changed?
Added CLI --format flag that allows consistent experience across all CLI commands to render different output.

• table is default. As is currently used in most command as immediate output.
• json is another option. Also deprecating --pjson flag used in couple of places (still works though).
• text/template - this is useful option for selecting only one or few fields from the output. For example one could get all unique workflow types currently running like:

./cadence --do samples-domain workflow listall --open --format '{{.WorkflowType}}' | uniq
main.sampleSignalCounterWorkflow

Why?
This continues work towards presentation layer in CLI.

It adds a consistent way to render output in different format. Template mode is useful if command output for some specific purpose, scripting or piping output to other commands.

While it was already possible to output result as json and then use additional utilities such as sed or jq for formatting, it will much easier now.

It will also be more consistent. Planning to add this to all commands producing some output.

Finally, the same templating system can be used to render standard output of commands. For example, with this change I included describe domain output rendered as a default template (if none other is provided by user).

How did you test it?
Tested locally.

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build cfbe49db-7018-418b-a9e6-3364bf52449b

• 200 of 254 (78.74%) changed or added relevant lines in 10 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.07%) to 56.947%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tools/cli/adminElasticSearchCommands.go	0	1	0.0%
tools/cli/taskListCommands.go	1	2	50.0%
tools/cli/adminTaskListCommands.go	0	2	0.0%
tools/cli/adminCommands.go	0	3	0.0%
tools/cli/workflowCommands.go	13	20	65.0%
tools/cli/render.go	151	168	89.88%
tools/cli/domainCommands.go	25	48	52.08%

Files with Coverage Reduction	New Missed Lines	%
common/task/weightedRoundRobinTaskScheduler.go	2	89.64%

Totals
Change from base Build 6334e043-04b6-4bf2-910b-6d6e60fadb7e:	0.07%
Covered Lines:	83576
Relevant Lines:	146761

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💛 - Coveralls