Move LLDB initialization commands to make attach configuration work (#20085)

misctools/lldb/init.lldb

@@ -0,0 +1,19 @@
+# This file is separate from .lldbinit because it has to be in the same directory as the Python
+# modules in order for the "attach" action to work.
+
+# Tell LLDB what to do when the debugged process receives SIGPWR: pass it through to the process
+# (-p), but do not stop the process (-s) or notify the user (-n).
+#
+# JSC's garbage collector sends this signal (as configured by Bun WebKit in
+# Thread::initializePlatformThreading() in ThreadingPOSIX.cpp) to the JS thread to suspend or resume
+# it. So stopping the process would just create noise when debugging any long-running script.
+process handle -p true -s false -n false SIGPWR
+
+command script import -c lldb_pretty_printers.py
+type category enable zig.lang
+type category enable zig.std
+
+command script import -c lldb_webkit.py
+
+command script delete btjs
+command alias btjs p {printf("gathering btjs trace...\n");printf("%s\n", (char*)dumpBtjsTrace())}