feat(realtime-perso): add new realtime-perso api

specs/realtime-personalization/common/parameters.yml

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+# path
+UserToken:
+  name: userToken
+  in: path
+  required: true
+  description: Unique identifier representing a user for which to fetch the personalization profile.
+  schema:
+    $ref: '../../common/schemas/SearchParams.yml#/userToken'

specs/realtime-personalization/common/schemas/personalizationFilters.yml

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+personalizationFilters:
+  type: object
+  additionalProperties: false
+  required:
+    - version
+    - userID
+    - search
+  properties:
+    version:
+      type: string
+      description: Version of the response format.
+    userID:
+      type: string
+      description: User ID of the user.
+    search:
+      type: object
+      description: |
+        Index personalization filters by index name.
+      additionalProperties:
+        $ref: '#/searchFilters'

specs/realtime-personalization/common/schemas/searchFilters.yml

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+searchFilters:
+  type: object
+  additionalProperties: false
+  properties:
+    indices:
+      type: array
+      items:
+        type: string
+      example: ['storefront', 'storefront_price_asc', 'storefront_price_desc']
+    strategy:
+      $ref: '#/strategy'
+    filters:
+      $ref: '#/searchFilter'
+
+searchFilter:
+  type: object
+  additionalProperties: false
+  properties:
+    session:
+      type: array
+      items:
+        type: string
+      example: ['brand:Dyson<score=12>']
+
+strategy:
+  type: string
+  enum:
+    - session
+    - hybrid
+  example: 'session'

specs/realtime-personalization/paths/getPersonalizationFilters.yml

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+get:
+  tags:
+    - filters
+  operationId: getIndexPersonalizationFilters
+  x-acl:
+    - recommendation
+  summary: Retrieve the index personalization filters
+  description: Retrieves the current index personalization filters.
+  parameters:
+    - $ref: '../common/parameters.yml#/UserToken'
+  responses:
+    '200':
+      description: OK
+      content:
+        application/json:
+          schema:
+            $ref: '../common/schemas/personalizationFilters.yml#/personalizationFilters'
+    '400':
+      $ref: '../../common/responses/BadRequest.yml'
+    '402':
+      $ref: '../../common/responses/FeatureNotEnabled.yml'
+    '403':
+      $ref: '../../common/responses/MethodNotAllowed.yml'
+    '404':
+      $ref: '../../common/responses/IndexNotFound.yml'

specs/realtime-personalization/spec.yml

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+openapi: 3.1.0
+info:
+  title: Realtime Personalization API
+  description: TODO
+  version: 0.0.1
+externalDocs:
+  # TODO: Update the URL
+  url: https://www.algolia.com/doc/guides/personalization/what-is-personalization/
+  description: |
+    Related guide: Algolia Realtime Personalization.
+components:
+  securitySchemes:
+    appId:
+      $ref: '../common/securitySchemes.yml#/appId'
+    apiKey:
+      $ref: '../common/securitySchemes.yml#/apiKey'
+servers:
+  # TODO: Update the URL
+  - url: https://personalization.{region}.algolia.com
+    variables:
+      region:
+        enum:
+          - us
+          - eu
+        default: us
+security:
+  - appId: []
+    apiKey: []
+tags:
+  - name: filters
+    x-displayName: Filters
+    description: |
+      Filters are used to personalize the search results for a user.
+      They are used to filter the search results based on the user's preferences.
+x-tagGroups:
+  - name: General
+    tags:
+      - filters
+paths:
+  # ######################
+  # ### Custom request ###
+  # ######################
+
+  /1/filters/{userToken}:
+    $ref: 'paths/getPersonalizationFilters.yml'