bugfix: invalid argument for "-D, --argument" flag: parse error, bare " in non-quoted-field

[howieyuen]

fix: #110

kusion compile flag, -D use pflag.StringSliceVarP() to parse string slice arguments, according to the comments here:
https://github.com/spf13/pflag/blob/d5e0c0615acee7028e1e2740a11102313be88de1/string_slice.go#L99

compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly.

so, use pflag.StringArrayVarP() instead, will prevent pflag from truncating long string by comma.

After replace, the compiled result meets expectation:

./kusion compile a.k -D a='["x","y","z"]' -D b='{"key": False}'

output:

a:
- x
- y
- z
b:
  key: false

[coveralls]

Coverage increased (+0.1%) to 74.828% when pulling 3477cca on howieyuen:compile-arguments into 2109bf4 on KusionStack:main.

[elliotxx]

lgtm

[markliby]

lgtm