Add PackageCompiler project and compilation script

This PR adds script for package compilation into binary

contrib/.gitignore

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+JuliaLSP_compiled

contrib/JuliaLSP/Project.toml

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+name = "JuliaLSP"
+uuid = "9488cb22-ff86-4d62-8f4a-077fe1791049"
+authors = ["Matsievskiy S.V. <matsievskiysv@gmail.com>"]
+version = "0.1.0"
+
+[deps]
+LanguageServer = "2b0e0bc5-e4fd-59b4-8912-456d1b03d8d7"
+SymbolServer = "cf896787-08d5-524d-9de7-132aaa0cb996"

contrib/JuliaLSP/precompile_app.jl

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+using JuliaLSP
+
+push!(ARGS, "arg")
+JuliaLSP.julia_main()

contrib/JuliaLSP/src/JuliaLSP.jl

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+module JuliaLSP
+
+using LanguageServer, LanguageServer.SymbolServer
+
+function julia_main()::Cint
+    server = LanguageServer.LanguageServerInstance(stdin, stdout)
+    server.runlinter = true
+    run(server)
+    return 0 # if things finished successfully
+end
+
+end # module

contrib/compile.sh

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+#!/usr/bin/env bash
+
+JULIABIN="julia"
+JULIAPROJ="JuliaLSP"
+JULIACOMP="JuliaLSP_compiled"
+
+REPO="https://github.com/julia-vscode/LanguageServer.jl"
+BRANCH="master"
+
+HL='\033[1;4;31m'
+NC='\033[0m'
+
+errorexit() {
+    echo -e ${HL}"$@"${NC}
+    exit 1
+}
+
+while [[ $# -gt 0 ]]
+    do
+    key="$1"
+
+    case $key in
+        -j|--julia)
+            JULIABIN="$2"
+            shift
+        ;;
+        -b|--branch)
+            BRANCH="$2"
+            shift
+        ;;
+        -r|--repo)
+            REPO="$2"
+            shift
+        ;;
+        *)
+            echo -e "Usage:\ncompile.sh [-j|--julia <julia binary>] [-b|--branch <repo branch>]" >&2
+            exit
+        ;;
+    esac
+    shift
+done
+
+echo -e ${HL}Updating packages${NC}
+
+$JULIABIN --project=${JULIAPROJ} --startup-file=no --history-file=no -e \
+          "import Pkg;
+          Pkg.add(Pkg.PackageSpec(url=\"${REPO}\", rev=\"${BRANCH}\"));
+          Pkg.update();" || errorexit Cannot update packages
+
+echo -e ${HL}Compiling...${NC}
+
+# Additional libs are needed for running tests
+$JULIABIN --startup-file=no --history-file=no -e \
+          "import Pkg;
+          Pkg.add(\"PackageCompiler\")
+          using PackageCompiler;
+          Pkg.activate(\"${JULIAPROJ}\");
+          create_app(\"${JULIAPROJ}\", \"${JULIACOMP}\",
+          force=true, precompile_execution_file=\"../test/runtests.jl\");" \
+              || errorexit Cannot compile packages
+
+echo -e ${HL}Compiled${NC}