Fix use of logger in distributed mode

[MilesCranmer]

Missing TensorBoardLogger extension import for workers.

Also I added a new feature to specify extensions for importing on workers.

[github-actions]

Benchmark Results

	master	788ce37...	master/788ce37f48c910...
search/multithreading	22.2 ± 1.5 s	21.7 ± 1.1 s	1.02
search/serial	33.7 ± 0.21 s	32.5 ± 0.14 s	1.04
utils/best_of_sample	1.9 ± 1.6 μs	1.9 ± 1.7 μs	1
utils/check_constraints_x10	11.3 ± 2.8 μs	11.5 ± 2.9 μs	0.99
utils/compute_complexity_x10/Float64	2.08 ± 0.11 μs	2.11 ± 0.11 μs	0.986
utils/compute_complexity_x10/Int64	2.06 ± 0.11 μs	2.02 ± 0.1 μs	1.02
utils/compute_complexity_x10/nothing	1.42 ± 0.1 μs	1.46 ± 0.11 μs	0.973
utils/insert_random_op_x10	5.96 ± 1.8 μs	5.91 ± 1.9 μs	1.01
utils/next_generation_x100	0.441 ± 0.07 ms	0.444 ± 0.12 ms	0.992
utils/optimize_constants_x10	0.0361 ± 0.0085 s	0.0365 ± 0.0084 s	0.99
utils/randomly_rotate_tree_x10	5.36 ± 0.62 μs	5.34 ± 0.62 μs	1
time_to_load	1.88 ± 0.0086 s	1.87 ± 0.022 s	1

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[coveralls]

Pull Request Test Coverage Report for Build 12141179326

Details

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 95.503%

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Totals
Change from base Build 12109819333:	0.03%
Covered Lines:	3122
Relevant Lines:	3269

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💛 - Coveralls