Handle multiple zstd streams appended to a single IR file

[diy1]

Request

An IR file could contain multiple zstd streams that are appended one after the other. This could happen when using the CLP Python logging library: for example, if we invoke a program multiple times, each invocation essentially appends a zstd IR stream to the same log file. Currently the log viewer only decodes and display the first stream. To the user, this is like all the data from subsequent invocations are lost.

Possible implementation

The log viewer will need to decompress multiple zstd streams until it reaches EOF. There might be some tricky issues like what if different streams use different headers.