chore: rename message => blob

[rootulp]

Part of #995

Renames the following on a case by case basis:

• Message => Blob
• message, msg, data => blob

Does not address:

• ADRs
• specs

It's likely that I didn't catch every instance due to human error

[codecov-commenter]

Codecov Report

Merging #1060 (d98713d) into main (42befe2) will not change coverage.
The diff coverage is 86.05%.

@@           Coverage Diff           @@
##             main    #1060   +/-   ##
=======================================
  Coverage   50.90%   50.90%           
=======================================
  Files          71       71           
  Lines        4410     4410           
=======================================
  Hits         2245     2245           
  Misses       1938     1938           
  Partials      227      227           

Impacted Files	Coverage Δ
app/prepare_proposal.go	0.00% <0.00%> (ø)
app/process_proposal.go	0.00% <0.00%> (ø)
pkg/inclusion/get_commit.go	0.00% <0.00%> (ø)
pkg/inclusion/nmt_caching.go	81.66% <ø> (ø)
pkg/shares/info_byte.go	100.00% <ø> (ø)
x/blob/payforblob.go	0.00% <0.00%> (ø)
pkg/shares/utils.go	52.00% <60.00%> (ø)
pkg/shares/share_splitting.go	63.80% <70.00%> (ø)
pkg/shares/split_sparse_shares.go	68.26% <71.42%> (ø)
pkg/shares/parse_sparse_shares.go	82.53% <93.10%> (ø)
... and 15 more

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[evan-forbes]

omg thanks for doing this! such a pain (we're never renaming it again).

let's fix the any conflicts and merge ASAP to avoid other conflicts here. Apologies that we didn't merge sooner

[rootulp]

Apologies that we didn't merge sooner

No worries, the merge conflicts were my fault and not difficult to resolve. This is ready for re-review.

[evan-forbes]

merge merge merge before we get more conflicts