0xPolygon/bor v0.3.4-beta3

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Release notes (post v0.3.4-beta2):

Improvements and feature addition:

1. Added a flag rpc.batchlimit to limit the maximum number of RPC requests in a batch. By default, 100 requests are allowed from this release otherwise the requests will be rejected (#657)
2. Added a flag rpc.returndatalimit to limit the maximum size of the result of an RPC request. By default, a maximum of 100000 bytes of result is allowed from this release otherwise the requests will be rejected (#657)
3. Fixed the misconfiguration of the triesInMemory flag. After this fix, a user can modify the number of block states (tries) stored in the memory (#691)
4. Added a flag http.ep-size and ws.ep-size to limit the execution pool size for HTTP and WS requests. Default value is 40 (#719)
5. Optimize GetBorReceipt function (#701)
6. Discard transactions which has size more than max code init size (#739)

Bug fixes:

1. Bug fixes for state sync events (like NewDeposits) and added test case for that (#695)
2. Added a check to see if block is nil in GetTransactionReceiptsByBlock to prevent panic (#736)
3. Use block related fields from environment context while mining for tracing to prevent panic (#728)