use StaticJsonRpcProvider where possible

[CAPtheorem]

Change to StaticJsonRpcProvider where possible

[codecov-commenter]

Codecov Report

Merging #461 (bfa0bac) into develop (25c5bbc) will not change coverage.
The diff coverage is 0.00%.

❗ Current head bfa0bac differs from pull request most recent head 5e017b4. Consider uploading reports for the commit 5e017b4 to get more accurate results

@@           Coverage Diff            @@
##           develop     #461   +/-   ##
========================================
  Coverage    76.09%   76.09%           
========================================
  Files           81       81           
  Lines         3037     3037           
  Branches       469      469           
========================================
  Hits          2311     2311           
  Misses         726      726           

Flag	Coverage Δ
batch-submitter	59.51% <ø> (ø)
contracts	86.05% <ø> (ø)
core-utils	68.16% <ø> (ø)
data-transport-layer	37.68% <ø> (ø)
message-relayer	72.22% <0.00%> (ø)

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

Impacted Files	Coverage Δ
packages/message-relayer/src/relay-tx.ts	71.15% <0.00%> (ø)

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