[Mysql]: Added defaultCurrentTimestamp and onUpdateCurrentTimestamp to datetime

[Angelelz]

The changes were made in date.common.ts due to the code that can be shared between timestamp and datetime data types in Mysql.

• The method defaultNow() has been deprecated in favor of defaultCurrentTimestamp
• The method onUpdateNow() has been deprecated in favor of onUpdateCurrentTimestamp
• An additional fsp config parameter was added to MysqlDateColumnBaseConfig class. This will be helpful for Drizzle-kit to be able to add to correct fsp configuration to ON UPDATE. See here
• No tests were added. The methods in this PR are only usable by drizzle-kit migration generation.

Users can now use the these methods in their schema definition as follows:

export const users = mysqlTable(
  "users",
  {
    id: char("id", { length: 26 }).primaryKey().notNull(),
    username: varchar("username", { length: 191 }).notNull(),
    createdAt: datetime("createdAt", { mode: "date", fsp: 3})
      .defaultCurrentTimestamp(),
    updatedAt: datetime("updatedAt", {mode: "date", fsp: 3})
      .defaultCurrentTimestamp()
      .onUpdateCurrentTimestamp(),
  },
);

This PR will close drizzle-team/drizzle-kit-mirror#596 and #921

[statusunknown418]

this needs merging :(

[kasperaamodt]

When will this be released? And will the functions accept and FSP param?

[mauriciabad]

@Angelelz I guess this PR should be merged to beta branch instead of main.

@AndriiSherman can you check this out and ensure it is added to the next release? It seems almost finished. :D

[Angelelz]

This PR will probably also close #624.

[basemkhirat]

Need merge.

[statusunknown418]

any updates on merging this PR? looks really useful and checks on it are passing

[aretrace]

I was about to open an issue regarding this exact thing. This implementation reflects a widespread common declaration pattern when implementing timestamp fields. I would like to urge a merge at the earliest possible convenience.

[statusunknown418]

well all changes seem approved and checks are passing let's hope they merge it soon! @aretrace