added contexts to Celestia DataAvailabilityLayerClient

[S1nus]

Overview

Adding Context parameters to the CheckBlockAvailability, SubmitBlock, and RetrieveBlocks functions of the DataAvailabilityLayerClient object. Work-in-progress.

Goal is to enable requests to be cancelled easily, or allow them to have deadlines.

Resolves#354.

Checklist

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

[codecov-commenter]

Codecov Report

Merging #623 (aa4d548) into main (d5e63f9) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@ Coverage Diff @@## main #623 +/- ##
==========================================
- Coverage 55.59% 55.46% -0.14% 
==========================================
Files 50 50 Lines 10301 10301 ==========================================
- Hits 5727 5713 -14 - Misses 3714 3723 +9 - Partials 860 865 +5 

Impacted Files	Coverage Δ
block/manager.go	65.34% <100.00%> (-3.47%)	⬇️
da/celestia/celestia.go	50.00% <100.00%> (ø)
da/celestia/mock/server.go	50.32% <100.00%> (ø)
da/grpc/grpc.go	73.13% <100.00%> (ø)
da/grpc/mockserv/mockserv.go	81.63% <100.00%> (ø)
da/mock/mock.go	79.54% <100.00%> (ø)

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[tzdybal]

One comment, but applies in multiple places - please rename variable from context to ctx.

[tzdybal]

Looks good. I left small comment regarding tests. Please rebase.

[tzdybal]

LGTM