[202506] [yang] VNET_ROUTE_TUNNEL yang model support for consistent hashing (#24684)

[NavdhaJindal]

Master PR: sonic-net/sonic-buildimage#24684

Why I did it
To support consistent ECMP for vxlan tunnels, according to specifications in sonic-net/SONiC#2099

Work item tracking
Microsoft ADO (number only):
How I did it
Added multi-value support for endpoint, mac and vni. Added consistent_hashing_buckets.

How to verify it
Run the tests added in this PR or build image with these changes and set the new attributes.

Why I did it

Work item tracking

• Microsoft ADO (number only):

How I did it

How to verify it

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[NavdhaJindal]

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[prabhataravind]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[NavdhaJindal]

/azp run

[azure-pipelines]

Commenter does not have sufficient privileges for PR 1900 in repo Azure/sonic-buildimage-msft

[prabhataravind]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[prsunny]

@prabhataravind , could you merge?

[prsunny]

@NavdhaJindal , please link the master PR

[NavdhaJindal]

Master PR: sonic-net/sonic-buildimage#24684