Add optional observed timestamp in the cps data api

- Added optional query parameter in cps data endpoints
- Updated service layer and notification to use observedTimestamp

Note:
- NCMP REST endpoints are not updated as a part of this patch
- NCMP does not sent observed timestamp when using cps data services

Issue-ID: CPS-477
Signed-off-by: puthuparambil.aditya <aditya.puthuparambil@bell.ca>
Change-Id: I1f92da3da7b3a13c45405fdf44e5fef861991d9a
Signed-off-by: Renu Kumari <renu.kumari@bell.ca>
diff --git a/cps-rest/src/main/resources/static/cpsData.yml b/cps-rest/src/main/resources/static/cpsData.yml
index 9c4f333..75d9544 100644
--- a/cps-rest/src/main/resources/static/cpsData.yml
+++ b/cps-rest/src/main/resources/static/cpsData.yml
@@ -55,6 +55,7 @@
       - $ref: 'components.yml#/components/parameters/dataspaceNameInPath'
       - $ref: 'components.yml#/components/parameters/anchorNameInPath'
       - $ref: 'components.yml#/components/parameters/requiredXpathInQuery'
+      - $ref: 'components.yml#/components/parameters/observedTimestampInQuery'
     requestBody:
       required: true
       content:
@@ -81,6 +82,7 @@
       - $ref: 'components.yml#/components/parameters/dataspaceNameInPath'
       - $ref: 'components.yml#/components/parameters/anchorNameInPath'
       - $ref: 'components.yml#/components/parameters/requiredXpathInQuery'
+      - $ref: 'components.yml#/components/parameters/observedTimestampInQuery'
     requestBody:
       required: true
       content:
@@ -107,6 +109,7 @@
       - $ref: 'components.yml#/components/parameters/dataspaceNameInPath'
       - $ref: 'components.yml#/components/parameters/anchorNameInPath'
       - $ref: 'components.yml#/components/parameters/requiredXpathInQuery'
+      - $ref: 'components.yml#/components/parameters/observedTimestampInQuery'
     responses:
       '204':
         $ref: 'components.yml#/components/responses/NoContent'
@@ -128,6 +131,7 @@
       - $ref: 'components.yml#/components/parameters/dataspaceNameInPath'
       - $ref: 'components.yml#/components/parameters/anchorNameInPath'
       - $ref: 'components.yml#/components/parameters/xpathInQuery'
+      - $ref: 'components.yml#/components/parameters/observedTimestampInQuery'
     requestBody:
       required: true
       content:
@@ -154,6 +158,7 @@
       - $ref: 'components.yml#/components/parameters/dataspaceNameInPath'
       - $ref: 'components.yml#/components/parameters/anchorNameInPath'
       - $ref: 'components.yml#/components/parameters/xpathInQuery'
+      - $ref: 'components.yml#/components/parameters/observedTimestampInQuery'
     requestBody:
       required: true
       content:
@@ -180,6 +185,7 @@
       - $ref: 'components.yml#/components/parameters/dataspaceNameInPath'
       - $ref: 'components.yml#/components/parameters/anchorNameInPath'
       - $ref: 'components.yml#/components/parameters/xpathInQuery'
+      - $ref: 'components.yml#/components/parameters/observedTimestampInQuery'
     requestBody:
       required: true
       content: