Support Terraform outputs of boolean types

[anovikov-el]

Description

Currently, RMK only supports Terraform outputs of a string type, when an output is prefixed with rmk_.
https://github.com/edenlabllc/rmk/blob/develop/docs/configuration/cluster-management/exported-environment-variables.md#exported-envi[…]ent-variables

If an output like TF_VAR_test_suites=true is provided, it is considered like a boolean type in RMK, leading to a panic.
This should be handled correctly, the boolean type should be allowed, in other cases a warning should be shown.

Steps to reproduce

Run any command with a boolean TF variable, e.g.:
TF_VAR_test_suites=true rmk cluster p -p

Expected behaviour

The boolean value like true/false is considered as a string and handled without any error.

Actual behaviour

The following panic occurs:

panic: interface conversion: interface {} is bool, not string
goroutine 1 [running]:
rmk/config.(*Config).GetTerraformOutputs(0xc0005b6480)
        /home/runner/work/rmk/rmk/config/config.go:229 +0x599
rmk/config.(*Config).InitConfig(0xc0005b6480, 0x1)
        /home/runner/work/rmk/rmk/config/config.go:124 +0x1b6
rmk/commands.Commands.clusterProvisionAction.func30(0xc0001cfcc0)
        /home/runner/work/rmk/rmk/commands/cluster_category.go:448 +0x65
github.com/urfave/cli/v2.(*Command).Run(0xc0007fd080, 0xc0001cfcc0, {0xc000036e60, 0x2, 0x2})
        /home/runner/go/pkg/mod/github.com/urfave/cli/v2@v2.27.1/command.go:279 +0x9dd
github.com/urfave/cli/v2.(*Command).Run(0xc0000be2c0, 0xc0001cfb80, {0xc0007fa6f0, 0x3, 0x3})
        /home/runner/go/pkg/mod/github.com/urfave/cli/v2@v2.27.1/command.go:272 +0xc2e
github.com/urfave/cli/v2.(*Command).Run(0xc000000000, 0xc0001cf900, {0xc0000d0040, 0x4, 0x4})
        /home/runner/go/pkg/mod/github.com/urfave/cli/v2@v2.27.1/command.go:272 +0xc2e
github.com/urfave/cli/v2.(*App).RunContext(0xc00023cc00, {0x2667a70?, 0x3093ca0}, {0xc0000d0040, 0x4, 0x4})
        /home/runner/go/pkg/mod/github.com/urfave/cli/v2@v2.27.1/app.go:337 +0x5db
github.com/urfave/cli/v2.(*App).Run(...)
        /home/runner/go/pkg/mod/github.com/urfave/cli/v2@v2.27.1/app.go:311
main.main()
        /home/runner/work/rmk/rmk/main.go:78 +0x3f

Environment info

RMK: v0.41.0+
OS: any
Shell: any
Terminal: any

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