Add blob and memo limits to NamespaceInfo (#670)

## Describe what has changed in this PR
Add `blob_size_limit_error` and `memo_size_limit_error` to NamespaceInfo

## Tell your future self why have you made these changes
`blob_size_limit_error` is the maximum size in bytes for payload fields
in workflow history events (e.g., workflow/activity inputs and results,
failure details, signal payloads). When exceeded, the server will reject
the operation with an error.

`memo_size_limit_error` is the maximum total memo size in bytes per
workflow execution.

Today, the size limit for input payloads is enforced on the server. SDK
doesn't have a reliable way to know whether the request will be rejected
on the server, because the size of the fields in the request exceeds
namespace-level configured `blob_size_limit_error` and
`memo_size_limit_error`. The motivation here, is for SDK to be able to
do the check, failing the workflow task, allowing the user to fix the
failure, rather than terminating the workflow on the server.

## Are there any breaking changes on binary or code level?
No

## If this breaks the Server, please provide the Server PR to merge
right after this PR was merged.
N/A

Author: simvlad