[Bugfix] Enable creation of tables whose fieldName otherwise clashes with SQL keywords such as `group`
In the nim discord ajusa previously encountered this issue where they had a database, but one of the columns they had was called `group`.
This causes issues with sqlite's SQL (and likely postgres but I didn't test that). In the language you can avoid those by escaping the name with `'`.

So minimal reproducible example:
```nim
import norm/[model, sqlite]

type A = ref object of Model
    group: string 

let x = A(group: "")
let con = open(":memory:", "", "", "")
con.createTables(x)
```
```txt
Error: unhandled exception: near "group": syntax error [DbError]
```

The SQL generated is 
```sql
CREATE TABLE IF NOT EXISTS "A"(group TEXT NOT NULL, id INTEGER NOT NULL PRIMARY KEY)
```

To fix this, the SQL it would need to generate would be this (can also use `"` instead of `'`):
```sql
CREATE TABLE IF NOT EXISTS "A"('group' TEXT NOT NULL, id INTEGER NOT NULL PRIMARY KEY)
```



A similar issue goes for `selectAll` as it generates for example this sql:
```nim
import norm/[model, sqlite]

type A* = ref object of Model
    group*: string 

let con = open(":memory:", "", "", "")

let y = """CREATE TABLE IF NOT EXISTS "A"('group' TEXT NOT NULL, id INTEGER NOT NULL PRIMARY KEY)"""
con.exec(sql y)

var objs = @[A(group: "")]
con.selectAll(objs)
```
```sql
SELECT "A".group, "A".id FROM "A"  WHERE 1
```

Should be generating
```sql
SELECT "A"."group", "A"."id" FROM "A"  WHERE 1
```