♻️ Refactor devenv build mechanism

This introduces multistage build process for devenv making
different dependencies build depend on its own (per example, when
jvm version is changed, only the jvm stage is rebuild)

This commit also introduces imagemagick 7.x custom build
in the same way as we have on public docker images, so on
devenv we use the same version.

backend/scripts/repl

@@ -77,8 +77,9 @@ export JAVA_OPTS="\
        -Djdk.attach.allowAttachSelf \
        -Dlog4j2.configurationFile=log4j2-devenv-repl.xml \
        -Djdk.tracePinnedThreads=full \
+       -Dim4java.useV7=true \
        -XX:+EnableDynamicAgentLoading \
-       -XX:-OmitStackTraceInFastThrow                    \
+       -XX:-OmitStackTraceInFastThrow  \
        -XX:+UnlockDiagnosticVMOptions \
        -XX:+DebugNonSafepoints \
        --sun-misc-unsafe-memory-access=allow \
@@ -106,9 +107,6 @@ export OPTIONS="-A:jmx-remote -A:dev"
 # Setup GC
 # export OPTIONS="$OPTIONS -J-XX:+UseZGC"
 
-# Enable ImageMagick v7.x support
-# export OPTIONS="-J-Dim4java.useV7=true $OPTIONS";
-
 export OPTIONS_EVAL="nil"
 # export OPTIONS_EVAL="(set! *warn-on-reflection* true)"