Fix null reference loading existing holdings and cash balance (QuantC…

…onnect#5925)

Algorithm Language can be case insensitive (QuantConnect#5924)

Algorithm Language can be case insensitive (QuantConnect#5924)

Algorithm Language can be case insensitive (QuantConnect#5924)

Algorithm Language can be case insensitive (QuantConnect#5924)

Algorithm Language can be case insensitive (QuantConnect#5924)

Fix FuncSecuritySeeder for python (QuantConnect#5923)

- Fix funcSecuritySeeder for python. Adding regression algorithm

Support all security types for benchmarks (QuantConnect#5919)

* Adjust benchmark subscription to dynamically determine best resolution

* Get types from SM

* Add red/green test set for security types

Add new CustomWeight, AlphaModel for AlphaStreams

- Add new CustomWeight PCM for alpha streams
- Add new AlphaStreams AlphaModule that will handle security additions
  and removals, removing this logic from AlphaStreamsBasicTemplateAlgo

Support all security types for benchmarks (QuantConnect#5919)

* Adjust benchmark subscription to dynamically determine best resolution

* Get types from SM

* Add red/green test set for security types