Rename telemetry to usage

[felixwang9817]

Signed-off-by: Felix Wang wangfelix98@gmail.com

What this PR does / why we need it: A few places in the codebase still refer to telemetry. This PR renames "telemetry" to "usage".

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[felixwang9817]

/kind housekeeping

[woop]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: felixwang9817, woop

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[codecov-commenter]

Codecov Report

Merging #1800 (760e70a) into master (cf488dc) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1800   +/-   ##
=======================================
  Coverage   84.85%   84.85%           
=======================================
  Files          92       92           
  Lines        6826     6826           
=======================================
  Hits         5792     5792           
  Misses       1034     1034           

Flag	Coverage Δ
integrationtests	84.77% <100.00%> (ø)
unittests	63.93% <100.00%> (ø)

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

Impacted Files	Coverage Δ
sdk/python/feast/usage.py	60.95% <100.00%> (ø)

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