Make ignorelist for module indexing configurable

[radeksimko]

Use-cases

When editor launches the LS on behalf of the user, it will attempt to index all initialized modules within the hierarchy.
Some users open directories which are relatively high up in the hierarchy, meaning that there is many directories to walk through, which in turn may consume CPU and filesystem I/O resources.

This is why we also avoid descending into certain directories which will never contain editable Terraform modules.

terraform-ls/internal/terraform/module/walker.go

Lines 22 to 29 in ac2194d

	// skipDirNames represent directory names which would never contain
	// plugin/module cache, so it's safe to skip them during the walk
	skipDirNames = map[string]bool{
	".git": true,
	".idea": true,
	".vscode": true,
	"terraform.tfstate.d": true,
	}

Users may however have additional directories in their workspace which they would like to ignore.

Proposal

Make the ignorelist configurable via options, similar to how other aspects of LS are configurable

terraform-ls/internal/settings/settings.go

Lines 16 to 28 in ac2194d

	type Options struct {
	// ModulePaths describes a list of absolute paths to modules to load
	ModulePaths []string `mapstructure:"rootModulePaths"`
	ExcludeModulePaths []string `mapstructure:"excludeModulePaths"`
	CommandPrefix string `mapstructure:"commandPrefix"`
	// ExperimentalFeatures encapsulates experimental features users can opt into.
	ExperimentalFeatures ExperimentalFeatures `mapstructure:"experimentalFeatures"`
	TerraformExecPath string `mapstructure:"terraformExecPath"`
	TerraformExecTimeout string `mapstructure:"terraformExecTimeout"`
	TerraformLogFilePath string `mapstructure:"terraformLogFilePath"`
	}

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