[Wait for #1963] [multi head attention] added unittest

[lhs8928]

 - Added layer/model unittest for multi head attention

Signed-off-by: hyeonseok lee <[email protected]>

[taos-ci]

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:octocat: cibot: @lhs8928, A builder checker could not be completed because one of the checkers is not completed. In order to find out a reason, please go to http://ci.nnstreamer.ai/nntrainer/ci/repo-workers/pr-checker/1964-202208182240140.10092496871948-b332e3044de444b7444398c27f936e031af9280f/.

[taos-ci]

:octocat: cibot: @lhs8928, A builder checker could not be completed because one of the checkers is not completed. In order to find out a reason, please go to http://ci.nnstreamer.ai/nntrainer/ci/repo-workers/pr-checker/1964-202208301709450.83279991149902-5a7b92775ebd779e67688b9fdc1275784ee1c6f5/.

[taos-ci]

:octocat: cibot: @lhs8928, A builder checker could not be completed because one of the checkers is not completed. In order to find out a reason, please go to http://ci.nnstreamer.ai/nntrainer/ci/repo-workers/pr-checker/1964-202209011649180.37418103218079-39ef970b39062695a8508b07a1b6a81ccad060d1/.

[taos-ci]

:octocat: cibot: @lhs8928, A builder checker could not be completed because one of the checkers is not completed. In order to find out a reason, please go to http://ci.nnstreamer.ai/nntrainer/ci/repo-workers/pr-checker/1964-202209021335130.15086698532104-500ab4f52784a7d1f86ceab4e9188d176bf3a39a/.