Set up Go workspace with go.work and individual module files for better dependency management.

Create independent formatting functions in terragrunt module to remove
dependency on terraform module. This significantly reduces dependencies
for users who only need terragrunt testing.

Changes:
- Add modules/terragrunt/format.go with formatting utilities
- Update init.go to use local formatting functions
- Remove terraform from terragrunt/go.mod dependencies
- Update workspace dependencies

Benefits:
- Users importing terragrunt no longer pull in HCL parsing libraries
- Reduced dependency bloat (no hashicorp/hcl, terraform-json, go-getter)
- Easier to update terragrunt independently from terraform

Create a shared formatting module to eliminate code duplication and
decouple terragrunt from terraform module dependencies.

Changes:
- Add modules/formatting module with HCL formatting utilities
- Update terraform module to use shared formatting functions
- Update terragrunt module to use shared formatting instead of terraform
- Remove duplicated format.go from terragrunt module
- Add comprehensive tests for formatting module
- Update go.work to include formatting module
- Update go.mod files with proper dependencies

Benefits:
- Terragrunt no longer depends on terraform module
- Eliminates code duplication (161 lines removed from terragrunt)
- Removes heavyweight dependencies from terragrunt:
  - hashicorp/hcl/v2
  - hashicorp/terraform-json
  - hashicorp/go-getter
  - tmccombs/hcl2json
  - zclconf/go-cty
- Maintains backward compatibility (all tests pass)
- Easier maintenance with single source of truth for formatting

Improve code clarity and maintainability:

Changes:
- Update comments in formatting module to reflect it's shared by both
  Terraform and Terragrunt (not Terraform-specific)
- Clarify comment in terragrunt/init.go about arguments being passed
  through to underlying terraform command
- Remove unnecessary replace directives from files/go.mod (logger and
  testing are not imported by this module)

All tests passing:
- formatting module tests: ✓
- terragrunt init tests: ✓
- builds successful: ✓

Fix CI build failure by reverting dependency upgrades that were
accidentally included in the modularization PR. This keeps the PR
focused solely on module structure changes.

Changes:
- Revert gruntwork-io/go-commons from v0.17.2 to v0.8.0
- Remove urfave/cli/v2 (keep v1.22.16)
- Downgrade dependencies in all module go.mod files
- Clean up indirect dependencies

The dependency upgrades introduced breaking API changes in
cmd/terratest_log_parser that should be addressed in a separate PR.

Fixes CI build errors in PR #1608

Updates go.sum with missing checksums for various dependencies' .mod files.

Add independent Go modules for terragrunt and dependencies

Bumps [github.com/ulikunitz/xz](https://github.com/ulikunitz/xz) from 0.5.10 to 0.5.14.
- [Commits](ulikunitz/xz@v0.5.10...v0.5.14)

---
updated-dependencies:
- dependency-name: github.com/ulikunitz/xz
  dependency-version: 0.5.14
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

…les/terraform/github.com/ulikunitz/xz-0.5.14

Bump github.com/ulikunitz/xz from 0.5.10 to 0.5.14 in /modules/terraform

This reverts PR #1608, which introduced independent Go modules for the
terragrunt dependency chain. Reverting back to the original monolithic
module structure.

Revert PR #1608: Revert modularization changes

Fix typo in docs for `InitAndValidateInputsE()`