fix(FEC-9247): add userId to kava reports

[Yuvalke]

Description of the Changes

add userId from kava config

CheckLists

• changes have been done against master branch, and PR does not conflict
• new unit / functional tests have been added (whenever applicable)
• test are passing in local environment
• Travis tests are passing (or test results are not worse than on master branch :))
• Docs have been updated

[OrenMe]

need to add test and update docs

[OrenMe]

update docs, see

playkit-js-kava/flow-typed/types/kava-config.js

Lines 4 to 14 in fdcc08d

	* @typedef {Object} KavaConfigObject
	* @property {string} [serviceUrl] - The Kaltura API server.
	* @property {number} [viewEventCountdown] - The interval in seconds that VIEW event will be sent.
	* @property {number} [resetSessionCountdown] - The interval in seconds that Kava session will be reset.
	* @property {number} [dvrThreshold] - Threshold in seconds from the live edge.
	* @property {string} [applicationVersion] - Used to send the application version from which the user is playing the entry.
	* @property {string} [playbackContext] - Used to send the id of the category from which the user is playing the entry.
	* @property {Function} [tamperAnalyticsHandler] - An optional handler to implement. Can be used to manipulate the model data before analytics event sent, or to cancel a certain analytics request.
	* @property {Object} [customVar1] - Custom objects field.
	* @property {Object} [customVar2] - Custom objects field.
	* @property {Object} [customVar3] - Custom objects field.