Add `vrf_global` resource module

[Ruchip16]

SUMMARY

This PR adds support for ios.vrf_global resource module

Here is the model design for the vrf_global module

ISSUE TYPE

• Feature Pull Request
• New Module Pull Request

COMPONENT NAME

cisco.ios.ios_vrf_global

MILESTONES

• [x] Parsing entire argspec ( which covers gathered and parsed state )
• [x] Merged and Rendered state working
• [x] Replaced state working
• [x] Overridden state working
• [x] Deleted and purged state
• [x] Unit tests & Integration tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.06%. Comparing base (c9841b5) to head (38ee04f). Report is 6 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1055 +/- ## ========================================== + Coverage 86.90% 87.06% +0.16% ========================================== Files 193 199 +6 Lines 11904 12098 +194 ========================================== + Hits 10345 10533 +188 - Misses 1559 1565 +6 ``` [see 14 files with indirect coverage changes](https://app.codecov.io/gh/ansible-collections/cisco.ios/pull/1055/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansible-collections)