feat: txsim cli

[cmwaters]

This PR creates a cli command for the txsim tool.

Example command:

txsim --key-path /path/to/keyring --rpc-endpoints localhost:26657 --grpc-endpoints localhost:9090 --seed 1234 --poll-time 1s --blob 5

One can also use environment variables.

[rootulp]

LGTM

[rootulp]

Suggested change

	Txsim is a tool for randomized transaction generation on celestia networks. The tool relies on
	Txsim is a tool for randomized transaction generation on Celestia networks. The tool relies on

[codecov-commenter]

Codecov Report

Merging #1650 (316bb2e) into main (a69fe55) will increase coverage by 0.15%.
The diff coverage is 58.15%.

@@            Coverage Diff             @@
##             main    #1650      +/-   ##
==========================================
+ Coverage   50.97%   51.12%   +0.15%     
==========================================
  Files          93       94       +1     
  Lines        5756     5893     +137     
==========================================
+ Hits         2934     3013      +79     
- Misses       2523     2568      +45     
- Partials      299      312      +13     

Impacted Files	Coverage Δ
test/txsim/account.go	67.44% <50.00%> (ø)
test/cmd/txsim/cli.go	57.66% <57.66%> (ø)
test/util/testnode/full_node.go	82.87% <100.00%> (ø)
x/blob/types/test_util.go	70.58% <100.00%> (ø)

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[evan-forbes]

super dope! can't wait to play around with sequences more