Support --all-namespaces flag for list commands

[pradeepitm12]

Cli should support --all-namespaces for all the list subcommands.

Currently, cli list subcommands take flag -n namespace as an input, which lists the given resource of a given namespace
tkn foo list -n bar

Support to all-namespaces flag will help the user to list a particular resource in all the namespaces.
tkn task list --all-namespaces

Adding to this, if all-namespaces flag is enabled then cli should show an extra column which tells the namespace too.

[pradeepitm12]

/kind feature

[waveywaves]

/assign

[waveywaves]

• TaskRun Add flag to list pipelineruns and taskruns from all namespaces #791
• PipelineRun Add flag to list pipelineruns and taskruns from all namespaces #791
• Task Add --all-namespaces --no-headers flags to task and pipeline list subcommand #840
• Pipeline Add --all-namespaces --no-headers flags to task and pipeline list subcommand #840
• PipelineResource Add no-headers and all-namespaces flags for resource list #971
• TriggerBinding
• TriggerTemplate
• EventListener
• Condition

[danielhelfand]

This was accidentally closed via #791 but should remain open until other resources also support this flag.

[waveywaves]

#840 opened to cover the requirement for tasks and pipelines