Add linter checks to GHA & Fix code to pass lints

Add linter checks to GHA & Fix code to pass lints.
The linters added are:
- whitespace: Tool for detection of leading and trailing whitespace
- gosec: Inspects source code for security problems
- gci: Gci control golang package import order and make it always deterministic
- misspell: Finds commonly misspelled English words in comments
- gomnd: An analyzer to detect magic numbers

The file utils/utils.go is excluded from the checks of gomnd, as uses magic numbers through the code

common/tx_test.go

@@ -19,5 +19,4 @@ func TestIdx(t *testing.T) {
 	assert.NotNil(t, err)
 	assert.Equal(t, ErrNumOverflow, err)
 	assert.Equal(t, Idx(0), i)
-
 }