feat: support config sql metastore using username and password by env

[yezizp2012]

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What's changed and what's your intention?

Resolve #16998 .

1. support config sqlite, postgres and mysql in --backend.
2. add new configs correspondingly: --sql-username, --sql-password and --sql-database, which only required for postgres and mysql.
3. --sql-endpoint should be configured in format {host}:{port} if the backend is set to postgres and mysql. For sqlite it should be the file path.

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Support configure sql metastore using username, password and database separately. The corresponding envs are also supported.

1. support config sqlite, postgres and mysql in --backend.
2. add new configs correspondingly: --sql-username, --sql-password and --sql-database, which only required for postgres and mysql.
3. --sql-endpoint should be configured in format {host}:{port} if the backend is set to postgres and mysql. For sqlite it should be the file path.

[kwannoel]

Suggested change

	pub sql_password: String,
	pub sql_password: Secret<String>,

Does this need to be secret as well?

[yezizp2012]

I'm not sure. Do we need it? @zwang28

[kwannoel]

Rest LGTM