Add "sequence-id" attribute for each term in qos classifers

[PranavAdityaCP]

Change Scope

Currently the terms in qos/classifers do not have any clear way based on which it can be ordered . Each term has a set of match conditions and an associated action and we could have multiple terms within a classifier, however it is not clear how to order the terms (in case the terms have overlapping match criteria, the order would determine the term and action that gets applied).
Please refer the open issue : #1387

Hence to address this requirement we are adding sequence-id as a new leaf under the paths

/qos/classifiers/classifier[name=*]/terms/term[id=*]/config/
/qos/classifiers/classifier[name=*]/terms/term[id=*]/status/

Note : It is backward compatible as it is a new leaf and NOT a key node

Tree View

+--rw classifiers
      +--rw classifier* [name]
         +--rw name       -> ../config/name
         +--rw config
         |  +--rw name?   string
         |  +--rw type?   enumeration {IPV4, IPV6, MPLS, IPV4_MULTICAST, IPV6_MULTICAST}
         +--ro state
         |  +--ro name?   string
         |  +--ro type?   enumeration {IPV4, IPV6, MPLS, IPV4_MULTICAST, IPV6_MULTICAST}
         +--rw terms
            +--rw term* [id]
               +--rw id            -> ../config/id
               +--rw config
               |  +--rw id?             string
  +            |  +--rw sequence-id?    uint32
               +--ro state
               |  +--ro id?             string
  +            |  +--ro sequence-id?    uint32
               +--rw conditions
               |  ...
               +--rw actions
                  ...

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[gemini-code-assist]

Code Review

This pull request adds a sequence-id leaf to the QoS classifier term grouping in openconfig-qos-elements.yang to define the matching order of terms. The review feedback identifies a minor grammatical typo in the description of the new leaf and provides a suggestion to correct it.

[gemini-code-assist]

There is a grammatical typo in the description of the sequence-id leaf: "rather than the relying only on order in the list." should be "rather than relying only on the order in the list."

Suggested change

	leaf sequence-id {
	type uint32;
	description
	"The sequence id determines the order in which terms
	are matched. The sequence id must be unique for each entry
	in terms. Target devices should apply the terms
	in ascending order determined by sequence id (low to
	high), rather than the relying only on order in the list.";
	}
	leaf sequence-id {
	type uint32;
	description
	"The sequence id determines the order in which terms
	are matched. The sequence id must be unique for each entry
	in terms. Target devices should apply the terms
	in ascending order determined by sequence id (low to
	high), rather than relying only on the order in the list.";
	}