chore: sql_simple_queries=3 for HANA queries

For applications using `sql_simple_queries=2` and `@sap/hana-client` the
query results will properly reflect `true` and `false` for `boolean`
fields, but when using `hdb` as driver the `boolean` datatype is not
returned by the HANA protocol. While `hdb` has the data type defined
([code](https://github.com/SAP/node-hdb/blob/49c69673279655aa6534a9a5f38248ebdcfe36d3/lib/protocol/common/TypeCode.js#L45https://github.com/SAP/node-hdb/blob/49c69673279655aa6534a9a5f38248ebdcfe36d3/lib/protocol/common/TypeCode.js#L45))
for some reason HANA does not recognize `hdb` as a client capable of
handling `boolean` column types. Therefor the data type returned is
`tinyint` this change adjusts the data converter to output `true` and
`false` when using `sql_simple_queries=1`. Allowing the database service
to generate the same SQL statements for both `1` and `2`. Saving an
additional loop on the application to convert the numeric results to
booleans.

hana/lib/drivers/hdb.js

@@ -2,12 +2,23 @@ const { Readable, Stream, promises: { pipeline } } = require('stream')
 const { StringDecoder } = require('string_decoder')
 const { text } = require('stream/consumers')
 
+const cds = require('@sap/cds')
 const hdb = require('hdb')
 const iconv = require('iconv-lite')
 
 const { driver, prom, handleLevel } = require('./base')
 const { isDynatraceEnabled: dt_sdk_is_present, dynatraceClient: wrap_client } = require('./dynatrace')
 
+if (cds.env.features.sql_simple_queries === 3) {
+  // Make hdb return true / false
+  const Reader = require('hdb/lib/protocol/Reader.js')
+  Reader.prototype._readTinyInt = Reader.prototype.readTinyInt
+  Reader.prototype.readTinyInt = function () {
+    const ret = this._readTinyInt()
+    return ret == null ? ret : !!ret
+  }
+}
+
 const credentialMappings = [
   { old: 'certificate', new: 'ca' },
   { old: 'encrypt', new: 'useTLS' },