Remove pandas and readers concept

[Spartee]

Remove the reader concept in favor of other libraries that will supply more capability. Focus moved to the query.

also change redisvl to rvl as the command line tool

[codecov-commenter]

Codecov Report

Merging #20 (7e44c96) into main (8cda41d) will increase coverage by 2.71%.
The diff coverage is 91.30%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   78.60%   81.31%   +2.71%     
==========================================
  Files          14       12       -2     
  Lines         472      455      -17     
==========================================
- Hits          371      370       -1     
+ Misses        101       85      -16     

Files Changed	Coverage Δ
redisvl/index.py	82.24% <90.00%> (+0.52%)	⬆️
redisvl/schema.py	89.65% <100.00%> (ø)

... and 1 file with indirect coverage changes