Database interface & auditing feature (#332)

* added audit manager

* Basic database DOA setup

* Added base config file

* added sqlite support and creation of schema

* added basic tests and config entry

* corrected issues of database is disabled

* fixed path for test

* WIP

* Added tests fixed config checking

* reverted files back to upstream

* reverted go.mod files

* no more test test test

* removed local testing details for psql

* hello

* added comments

* increased ping to 30 seconds

* renamed database table and added additional condition around test

* removed database test details

* goimport ran on all files

* WIP

* first attempt at migration

* fixes for migration system

* Migration system logger interface implemented

* fixes to print functions

* added write pooling pass

* gofmt :D

* formatted imports correctly

* removed old code

* added creation of migration

* gofmt

* :D Hello

* ❌ 🏎️

* maybe one day i will remember to revert go mod files

* checked err return condition correctly

* first changes for PR feedback

* code clean up

* protect Connected with RWmutex & event with mutex

* : D

* we can just pretend like it never happened

* MOved migrations back to source directory and added README

* readme formatting update

* Addd command line override for datadir

* use correct var when creating a migration and confirm folder is created

* Check if database version is newer than latest migration and also you know make migrations work.....

* uses filepath instead of manual path to use correct path seperator

* Add connection message and lower timeout

* Added support for sslmode for psql

* no longer force Close of database instead allow driver to maage

* Added closer func to test output

* sslmode added to example config

database/db_types.go

@@ -0,0 +1,38 @@
+package database
+
+import (
+	"errors"
+	"sync"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/thrasher-corp/gocryptotrader/database/drivers"
+)
+
+// Database holds a pointer to sql connection, DataPath which is used for file based databases
+// and a pointer to a Config struct
+type Database struct {
+	Config   *Config
+	DataPath string
+	SQL      *sqlx.DB
+
+	Connected bool
+	Mu        sync.RWMutex
+}
+
+// Config holds connection information about the database what the driver type is and if its enabled or not
+type Config struct {
+	Enabled                   bool   `json:"enabled"`
+	Driver                    string `json:"driver"`
+	drivers.ConnectionDetails `json:"connectionDetails"`
+}
+
+// Conn is a global copy of Database{} struct
+var Conn = &Database{}
+
+var (
+	// ErrNoDatabaseProvided error to display when no database is provided
+	ErrNoDatabaseProvided = errors.New("no database provided")
+
+	// SupportedDrivers slice of supported database driver types
+	SupportedDrivers = []string{"sqlite", "postgres"}
+)