Add .gitignore entries for IDE and project-specific files

.gitignore

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+/target
+Cargo.lock
+**/*.rs.bk
+.direnv
+.envrc
+flake.lock
+.junie/

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml