account: segregate holdings by credentials for future multi-key management (#956)

* exchanges/account: shift credentials to account package and segregate funds to keys

* merge: fixes

* linter: fix

* Update exchanges/account/account.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* glorious: nits + protection for string panic

* glorious_suggestion: add method for matching keys

* linter: fix tests

* account: add protected method for credentials minimizing access, display full account details to rpc.

* linter: spelling kweeeeeeen

* accounts/portfolio: clean/check portfolio code and quickly check balances from change. Add protected method for future matching.

* accounts: theres no point in pointerising everything

* linter: ok pointerise this then...

* exchanges: fix regression add in little notes.

* glorious: nits

* Update exchanges/account/credentials.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/account/credentials_test.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/account/credentials_test.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* glorious: nits

* gloriously: fix glorious glorious test gloriously

Co-authored-by: Ryan O'Hara-Reid <ryan.oharareid@thrasher.io>
Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

exchanges/interfaces.go

@@ -85,7 +85,7 @@ type IBotExchange interface {
 	UpdateOrderExecutionLimits(ctx context.Context, a asset.Item) error
 
 	AccountManagement
-	GetCredentials(ctx context.Context) (*Credentials, error)
+	GetCredentials(ctx context.Context) (*account.Credentials, error)
 	ValidateCredentials(ctx context.Context, a asset.Item) error
 
 	FunctionalityChecker