Fixes function call in default value of a column in CREATE TABLE statement

[GuptaManan100]

Description

This PR fixes function call in default value of a column in CREATE TABLE statement. The function calls must be parenthesised according to the syntax.

Related Issue(s)

• Fixes Function calls in DEFAULT value of CREATE TABLE statement #8424

Checklist

• Tests were added or are not required
• Documentation was added or is not required

[harshit-gangal]

e2e tests are failing

2021-07-07T15:16:02.5552905Z     misc_test.go:520: 
2021-07-07T15:16:02.5553418Z         	Error Trace:	misc_test.go:549
2021-07-07T15:16:02.5553949Z         	            				misc_test.go:520
2021-07-07T15:16:02.5554495Z         	Error:      	Received unexpected error:
2021-07-07T15:16:02.5557520Z         	            	vtgate: http://fv-az184-575.3ow45vhwbzuu5incsxmygykede.cx.internal.cloudapp.net:16225/: target: ks.-80.master, used tablet: test-9087 (localhost): vttablet: rpc error: code = InvalidArgument desc = You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(TRIM(' check '))
2021-07-07T15:16:02.5560411Z         	            	)' at line 2 (errno 1064) (sqlstate 42000) (CallerID: userData1): Sql: "create table function_default (\n\tx varchar(25) default (TRIM(' check '))\n)", BindVars: {}
2021-07-07T15:16:02.5562404Z         	            	target: ks.80-.master, used tablet: test-9090 (localhost): vttablet: rpc error: code = InvalidArgument desc = You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(TRIM(' check '))
2021-07-07T15:16:02.5564699Z         	            	)' at line 2 (errno 1064) (sqlstate 42000) (CallerID: userData1): Sql: "create table function_default (\n\tx varchar(25) default (TRIM(' check '))\n)", BindVars: {} (errno 1064) (sqlstate 42000) during query: create table function_default (x varchar(25) DEFAULT (TRIM(" check ")))
2021-07-07T15:16:02.5566140Z         	Test:       	TestFunctionInDefault
2021-07-07T15:16:02.5566907Z         	Messages:   	for query: create table function_default (x varchar(25) DEFAULT (TRIM(" check ")))
2021-07-07T15:16:02.5567847Z --- FAIL: TestFunctionInDefault (0.01s)