fix: Quote context names

[pranaysreeram]

kubectl works fine with context names that have whitespace

For context name "ctx1 (with whitespace)", you see the following error in k9s:

[mpas97]

There was already a similar issue and MR. But they were closed. I guess due to missing cli integration. Maybe you could also include some tests like done previously (see #3302 and #3303)

[derailed]

/cc @pranaysreeram

[pranaysreeram]

/cc @pranaysreeram

@derailed @mpas97 Let me know if anything else needed!