Add attrProto.release_s interface (#22977)
### Description
Add AttributeProto.release_s interface, which is used to obtain the
string in the attribute using move semantics instead of copying it
### Motivation and Context
The ep_context node stores a lot of information in attributes, which may
cause the memory usage to increase. Use this interface to avoid memory
waste
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Co-authored-by: GenMing Zhong <genmingz@xlnx.xilinx.com>
Co-authored-by: genmingz <genmingz@amd.com>
