[CON-89] Increase tm event buffer to reduce critical path backpressure (#2428)

## Describe your changes and provide context
Currently, the buffer for tendermint events is too small to properly
handle large amounts of traffic, since filling the buffer up will slow
down the critical path for execution, resulting in potentially longer
block times or at least node falling behind.


## Testing performed to validate your change
Tested in loadtest cluster and detacehd pacific-1 RPC

Author: udpatil

sei-tendermint/internal/eventbus/event_bus.go

@@ -13,7 +13,7 @@ import (
 	"github.com/tendermint/tendermint/types"
 )
 
-var DefaultBufferCapacity = 100
+var DefaultBufferCapacity = 10000
 
 // Subscription is a proxy interface for a pubsub Subscription.
 type Subscription interface {