fix(CLI): can not create external tables with format options

[jonahgao]

Which issue does this PR close?

Closes #10737.

Rationale for this change

When setting format options for TableOptions,

datafusion/datafusion-cli/src/exec.rs

Line 376 in 09dde27

table_options.alter_with_string_hash_map(options)?;

the current_format of TableOptions must already exist, which means set_file_format must be called with a non-none file type first.

datafusion/datafusion/common/src/config.rs

Lines 1185 to 1187 in 09dde27

	let Some(format) = &self.current_format else {
	return _config_err!("Specify a format for TableOptions");
	};

What changes are included in this PR?

Are these changes tested?

Yes

Are there any user-facing changes?

No

[berkaysynnada]

Good catch 👍🏻 This explicit setup may not be very user-friendly, but it's necessary since we accept file formats directly from CreateExternalTable rather than from OPTIONS.

[comphead]

lgtm thanks @jonahgao
💪

[alamb]

Thank you @jonahgao 🙏

[jonahgao]

Thanks for the review @berkaysynnada @comphead @alamb