[ja] add ~ておく conjugation #1399

Acknowledged Regression: -0.05%

✅ 3 untouched benchmarks

🆕 2 new benchmarks
⁉️ 2 (👁 2) dropped benchmarks

	Benchmark	`master`	`khaitruong922:teoku`	Change
👁	`japanese transformations (n=72)`	18.5 ms	N/A	N/A
🆕	`japanese transformations (n=76)`	N/A	23 ms	N/A
👁	`japanese transformations-full (n=197)`	45.5 ms	N/A	N/A
🆕	`japanese transformations-full (n=207)`	N/A	48.3 ms	N/A