Requires don't resolve if they are not top-level

[chrisrink10]

Required names and aliases do not resolve if they are not first imported top-level:

basilisp.user=> (do (require '[clojure.set :as set]) set/union)
Traceback (most recent call last):
  File "/Users/christopher/Projects/basilisp/src/basilisp/cli.py", line 139, in repl
    result = eval_str(lsrc, ctx, ns, eof)
  File "/Users/christopher/Projects/basilisp/src/basilisp/cli.py", line 51, in eval_str
    last = compiler.compile_and_exec_form(form, ctx, ns)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/__init__.py", line 133, in compile_and_exec_form
    lisp_ast = analyze_form(ctx.analyzer_context, form)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 3253, in analyze_form
    return _analyze_form(ctx, form).assoc(top_level=True)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 636, in _analyze_form
    return f(ctx, form).fix_missing_locations(form_loc)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 3194, in _analyze_form
    return _list_node(ctx, form)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 2737, in _list_node
    return handle_special_form(ctx, form)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 1661, in _do_ast
    statements, ret = _body_ast(ctx, form.rest)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 669, in _body_ast
    body_expr = _analyze_form(ctx, ret_form)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 636, in _analyze_form
    return f(ctx, form).fix_missing_locations(form_loc)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 3208, in _analyze_form
    return _symbol_node(ctx, form)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 3017, in _symbol_node
    return _resolve_sym(ctx, form)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 2995, in _resolve_sym
    return __resolve_namespaced_symbol(ctx, form)
  File "/Users/christopher/Projects/basilisp/src/basilisp/lang/compiler/analyzer.py", line 2911, in __resolve_namespaced_symbol
    form=form,
basilisp.lang.compiler.exception.CompilerException: unable to resolve static or class member 'set/union' in this context {:phase :analyzing :line 1 :form set/union :col 38}

Related to #544

[chrisrink10]

https://technomancy.us/143