[Feature] Log printing in alphabetical order when creating a replay buffer

[nikhlrao]

Description

When a replay buffer is being created, the storage is printed on the log. This print being printed in alphabetical order was a nice to have and this change brings in that.

Motivation and Context

Close issue #508

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Remove all that do not apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of examples)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #573 (682be9d) into main (7edad2d) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #573   +/-   ##
=======================================
  Coverage   86.96%   86.96%           
=======================================
  Files         121      121           
  Lines       21819    21819           
=======================================
  Hits        18975    18975           
  Misses       2844     2844           

Flag	Coverage Δ
linux-cpu	85.29% <100.00%> (ø)
linux-gpu	86.74% <100.00%> (ø)
linux-outdeps-gpu	75.40% <100.00%> (ø)
linux-stable-cpu	85.27% <100.00%> (ø)
linux-stable-gpu	86.74% <100.00%> (ø)
macos-cpu	85.06% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
torchrl/data/replay_buffers/storages.py	90.26% <100.00%> (ø)

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[vmoens]

LGTM