Add stat changes to new Gen 9 moves

[jemarq04]

This PR addresses issue #1326 by adding missing stat changes to make-it-rain and all other new moves added in Scarlet/Violet that were missing this data. I also added some meta data for the move syrup-bomb to store the information that it "lasts" for exactly 3 turns (dropping the enemy's speed each turn for three turns).

[pokeapi-machine-user]

A PokeAPI/api-data refresh has started. In ~45 minutes the staging branch of PokeAPI/api-data will be pushed with the new generated data.

The staging branch will be deployed in our staging environment and the entire API will be ready to review.

A Pull Request (master<-staging) will be also created at PokeAPI/api-data and assigned to the PokeAPI Core team to be reviewed. If approved and merged new data will soon be available worldwide at pokeapi.co.

[pokeapi-machine-user]

The updater script has finished its job and has now opened a Pull Request towards PokeAPI/api-data with the updated data.

The Pull Request can be seen deployed in our staging environment when CircleCI deploy will be finished (check the start time of the last build).