chore(v700) : Finishing work for release v7.0.0 SDK-3782

[piyush-kukadiya]

• [x] Rename class names

  • [x] FileCache → DiskMemory
  • [x] LruCache → InMemoryLruCache

• [x] Rename method names in CTCaches

  • [x] imageCache() → imageInMemory()
  • [x] gifCache() → gifInMemory()
  • [x] fileLruCache() → fileInMemory()
  • [x] imageCacheDisk() → imageDiskMemory()
  • [x] gifCacheDisk() → gifDiskMemory()
  • [x] fileCacheDisk() → fileDiskMemory()

• [x] Remove not needed public APIs from CleverTapAPI

  • [x] doesFileExistForUrl()
  • [x] getFilePathForUrl()

• [x] Add proguard rules for Media3

• [x] Add code documentation @piyush-kukadiya

  • [x] FileMemoryAccessObject.kt
  • [x] FileMemoryV2.kt
  • [x] InAppGifMemoryAccessObjectV1.kt
  • [x] InAppGifMemoryV1.kt
  • [x] InAppImageMemoryAccessObjectV1.kt
  • [x] InAppImageMemoryV1.kt
  • [x] Memory.kt
  • [x] MemoryAccessObject.kt
  • [x] MemoryConfig.kt
  • [x] MemoryCreator.kt
  • [x] FileCleanupStrategy.kt
  • [x] FileCleanupStrategyCoroutine.kt
  • [x] FileCleanupStrategyExecutors.kt
  • [x] FileResourcesRepo.kt
  • [x] FileResourcesRepoFactory.kt
  • [x] FileResourcesRepoImpl.kt
  • [x] DiskMemory.kt
  • [x] InMemoryLruCache.kt

• [x] Add developer docs

  • [x] CustomCodeTemplates.md @vasct
  • [x] AppFunctions.md @vasct
  • [x] Update Variables.md for file vars
  • [x] update Examples.md
  • [x] Doc changes for exoplayer migration @CTLalit
  • [x] update CTPushTemplates.md for five icons Already part of https://github.com/CleverTap/clevertap-android-sdk/pull/638

• [x] Update changelog @Anush-Shand

  • [x] CTCoreChangelog
  • [x] CTPushTemplatesChangeLog
  • [x] Root ChangeLog

• [x] Update Sample App

• [x] Update SDK version

• [x] Run copyTemplates after all doc updates