Add manifest validator as part of the microsoft plugin generation

[maisarissi]

When choosing "microsoft" as --type, we should make sure Kiota relies on Manifest validator library to validate and be sure we are generating a valid plugin.

[andrueastman]

Do we need to update the spec to include microsoft as an option

kiota/specs/cli/plugin-add.md

Line 49 in bc4fcd4

| `--type \| -t` | Yes | openai | The target type of plugin for the generated output files. Accepts multiple values. Possible values are `openai` and `apimanifest`. Defaults to `apimanifest`| Yes |

as #4416 is currently generating the microsoft plugin type when the parameter apimanifest type is passed?

[maisarissi]

Specs are going to be updated to also add microsoft as a valid --type. The current output being generated when passing --type apimanifest is the desired outcome to when using microsoft.