Lazily convert numeric strings to Lisp numbers in Eshell

This should reduce the number of issues with Eshell converting strings
to numbers too aggressively and losing information (e.g. "001" -> 1)
while still allowing almost all of the beneficial uses, like summing a
list of numeric strings with '+'.

* lisp/eshell/esh-util.el (eshell--do-mark-numeric-string): New
function.
(eshell-convert-to-number): Make obsolete in favor of...
(eshell-mark-numeric-string): ... this.  Update callers.

* lisp/eshell/esh-arg.el (eshell--numberlike-p): New function...
(eshell-concat-1): ... use it.

* test/lisp/eshell/esh-util-tests.el:  Reimplement type conversion tests
to use 'eshell-convertible-to-number-p' instead.

* test/lisp/eshell/esh-var-tests.el
(esh-var-test/interp-var-splice-concat, esh-var-test/interp-concat-cmd)
(esh-var-test/interp-convert-var-split-indices)
(esh-var-test/interp-convert-quoted-var-split-indices)
(esh-var-test/interp-convert-cmd-multiline)
(esh-var-test/interp-convert-cmd-split-indices): Adjust tests to check
the new behavior.

* doc/misc/eshell.texi (Type Conversion): New section.
(Expansion): Clarify concatenation behavior.

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