LDpred2: Test LDSC regression result

[deepchocolate]

Is your feature request related to a problem? Please describe.
One important step in ldpred2 is the LD-score regression. Currently, the output of this is not tested.

containers/usecases/LDpred2/ldpred2.R

Lines 248 to 251 in c36ae83

	cat('\n### Running LD score regression\n')
	ldsc <- with(df_beta, snp_ldsc(ld, ld_size, chi2=(beta/beta_se)^2, sample_size=n_eff, blocks=NULL))
	h2_est <- ldsc[["h2"]]
	cat('Results:', 'Intercept =', ldsc[["int"]], 'H2 =', h2_est, '\n')

Describe the solution you'd like
Reorganize ldpred2.R so that this step is easy to test by moving code into the fun.R script so that it can be run separately. It's probably best to add this as part of testing the results of the tutorial in usecases/LDpred2_test/unittests/tutorial.R. Might aswell add a command-line interface to bigsnpr::snp_ldsc while at it.

Describe alternatives you've considered
None

Additional context
None

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