Updated requirements.txt files

[Jaybsoni]

Updated the requirements.txt file by pinning the version #s for the dependancies. This way we ensure that users can use pip install -r requirements.txt and get a stable version of the plugin. A similar change is made for the requirements file in the docs folder.

Finally, a new requirements-ci.txt is added for our ci pipeline so that we can install the latest version of the dependancies and update the plugins accordingly.

[codecov]

Codecov Report

Merging #102 (7309c1f) into master (629b0bc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #102   +/-   ##
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  Coverage   99.23%   99.23%           
=======================================
  Files           8        8           
  Lines         391      391           
=======================================
  Hits          388      388           
  Misses          3        3           

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[rmoyard]

You should be able to pass the doc ci check, you just need to adapt some dependencies number e.g. numpy. If you are not sure, go on action and take a look at the previous successful run and what was the version number of failing packages.

[antalszava]

[sc-17333]

[rmoyard]

Thanks @Jaybsoni, it looks good expect the `requirements-ci.txt, look at my related comment.

[rmoyard]

Here as discussed in the meeting, you should have only direct dependencies ```

pennylane
cirq-core
cirq-pasqal
numpy

[rmoyard]

Thanks @Jaybsoni, it looks good to me 💯