chore!: renaming PayForData to PayForBlob

[distractedm1nd]

Overview

celestia-app renames PayForData to PayForBlob in https://github.com/celestiaorg/celestia-app/pull/978 node will rename it with https://github.com/celestiaorg/celestia-node/pull/1582

This PR changes the endpoint called at celestia-node, variable names, documentation, and breaks the client's API. Draft for now because we haven't merged it in node.

TODO:

• [ ] Update docker compose to fix CI once released in node

Checklist

• [X] New and updated code has appropriate documentation
• [X] New and updated code has new and/or updated testing
• [x] Required CI checks are passing
• [x] Visual proof for any user facing features like CLI or documentation updates
• [x] Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #42 (c2f0076) into main (1967ead) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   54.54%   54.54%           
=======================================
  Files           2        2           
  Lines          88       88           
=======================================
  Hits           48       48           
  Misses         34       34           
  Partials        6        6           

Impacted Files	Coverage Δ
client.go	51.80% <100.00%> (ø)

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[tzdybal]

We should release this as v0.3.0.