modified PgsqlAdapter and added groupBy fields

[realtemirov]

Fix SQL errors in trend query builder

1. Ambiguous column error (created_at) for join cases

• Issue:
  When I use joins, Postgres raised:

SQLSTATE[42702]: Ambiguous column: 7 
ERROR: column reference "created_at" is ambiguous

• Cause:
  After joining tables, the query should reference columns as "table"."column".
  But in our case it was generated as "table.column", which Postgres treated as a single literal column name instead of a qualified column.
• Fix:
  Removed extra quotes when building the expression.

// Before
return "to_char(\"{$column}\", '{$format}')";

// After
return "to_char({$column}, '{$format}')";

2. Grouping error (table.id)

• Issue:
  Postgres raised:

SQLSTATE[42803]: Grouping error: 7 
ERROR: column "table.id" must appear in the GROUP BY clause or be used in an aggregate function

• Cause:
  Query only grouped by the date alias, but selected table.*.
• Fix:
  Explicitly added group by fields to avoid mismatch.

// Before
->groupBy($this->dateAlias)

// After
->groupBy($this->groupBy)

✅ With these fixes:

1. Ambiguous created_at references are resolved.
2. Grouping is aligned with selected columns.