Added active flag in get command

[AjazSumaiya]

Added --active flag in get command , to retrieve last successfull deployed mesh.

Description

aio api-mesh get should accept --active flag.

Related Issue

Motivation and Context

How Has This Been Tested?

Command Description

Default behavior should still work as is

1. aio api-mesh get : returns mesconfig

With --active flag changes

1. aio api-mesh get --active or aio api-mesh get --a : should return last successful deployed meshConfig
   create a valid mesh -- both should return same meshCOnfig if successfully deployed

update with invalid mesh which failed at build -- default should return failed meshConfig and with ---active the valid mesh created should be returned

--active

Default

2. . aio api-mesh get --active or aio api-mesh get --a : should return no active deployment found

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

The merge-base changed after approval.