Implement edge long swipe gesture to new back gesture affordance

Author: Nico <nicorg2529@gmail.com>
Date:   Sun Mar 8 11:39:47 2020 +0000

    Implement edge long swipe gesture [1/3]

    The gesture will activate if user executes edge swipe for a long
    horizontal motion. The triggered action is configurable in Button
    Settings.

    Reference:
    https://gerrit.dirtyunicorns.com/q/topic:%22back-longswipe-actions%22

    Change-Id: Ie1bbe6645b6a00d346af60d6bb5e4d584997d6e9

Author: LuK1337 <priv.luk@gmail.com>
Date:   Thu Nov 25 17:39:29 2021 +0100

    Use custom flag for edge long swipe gesture

    Previously we were using same flags that'd be used for regular back key
    long press thus being unable to determine whether the event was sent
    from EdgeBackGestureHandle or not.

    Fixes: https://gitlab.com/LineageOS/issues/android/-/issues/4194


    Change-Id: I5c4fd455f581ac5c9c5e3a146095be33e82e8d6e

Author: someone5678 <nemui3353@gmail.com>
Date:   Fri, 14 Jul 2023 17:26:19 +0900

    Adapt and fix from original long swipe gesture impl

    Change-Id: I22c6442299df0cf15d046718fa40df6fb6aee07c
Signed-off-by: someone5678 <nemui3353@gmail.com>

Author: someone5678 <nemui3353@gmail.com>
Date:   Sun Jul 30 20:55:13 2023 +0900

    Flip back gesture canvas if started from left

    * Better than constant right arrow direction

    Change-Id: I45108f185130d6f778660ba11f3beb758826ba99
Signed-off-by: someone5678 <nemui3353@gmail.com>

Author: someone5678 <nemui3353@gmail.com>
Date:   Tue Aug 1 12:25:00 2023 +0900

    Always add second arrow in front on long swipe

    * After last commit if long swipe gesture started from left, second arrow is added
      in back instead of front.

    * This looks unnatural and causes inconsistency with right.

    * Hardcode to -1 so that second arrow always added in front of first one.

    Change-Id: Ia043a749218ab40c40520736fa54ffaa26919137
Signed-off-by: someone5678 <nemui3353@gmail.com>

Change-Id: I6a54d781b64aeec278b9f1be4a42bcfaf681b160