textio (and fileio in general) takes too long to estimate sizes of large globs

As a workaround we could introduce a way to not perform size estimation when reading large globs. For example Java SDK has withHintMatchesManyFiles() option.

https://github.com/apache/beam/blob/850e8469de798d45ec535fe90cb2dc5dbda4974a/sdks/java/core/src/main/java/org/apache/beam/sdk/io/TextIO.java#L371

Additionally, seems like we are repeating the size estimation where the same PCollection read from a file-based source is applied to multiple PTransforms.

See following for more details.

https://stackoverflow.com/questions/60874942/avoid-recomputing-size-of-all-cloud-storage-files-in-gcsio-beam-python-sdk